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<STREET1>1015 31ST ST. NW
<CITY>WASHINGTON
<STATE>DC
<ZIP>20007
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<CONFORMED-NAME>UFO Group, Inc.
<CIK>0001358613
<IRS-NUMBER>201442332
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<TEXT>
<HTML>
<HEAD>
</HEAD>
<BODY BGCOLOR="#FFFFFF" LINK=BLUE  VLINK=PURPLE>
<BR>
<FONT SIZE=3 ><A HREF="#06WDC1129_1">QuickLinks</A></FONT>
<font size=3> -- Click here to rapidly navigate through this document</font>
<P ALIGN="CENTER">


<FONT SIZE=2><B>As filed with the Securities and Exchange Commission on May&nbsp;2, 2006

  </B></FONT>

</P>

<P ALIGN="RIGHT"><FONT SIZE=2><B>


Registration No.&nbsp;333-133200

  </B></FONT></P>

<P><FONT SIZE=2><B> <hr noshade width=100% align=left size=4>
<hr noshade width=100% align=left size=1>  </B></FONT></P>

<P ALIGN="CENTER"><FONT SIZE=5><B>SECURITIES AND EXCHANGE COMMISSION<BR>  </B></FONT><FONT SIZE=2><B>Washington, D.C. 20549  </B></FONT></P>

<HR NOSHADE ALIGN="CENTER" WIDTH="120">
<P ALIGN="CENTER">


<FONT SIZE=5><B>AMENDMENT NO.&nbsp;1 TO<BR>
FORM S-3<BR>  </B></FONT><FONT SIZE=3><B>REGISTRATION STATEMENT<BR>  </B></FONT><FONT SIZE=3><B><I>UNDER<BR>
THE SECURITIES ACT OF 1933

 </I></B></FONT>

</P>

<HR NOSHADE ALIGN="CENTER" WIDTH="120">
<P ALIGN="CENTER"><FONT SIZE=5><B>COGENT COMMUNICATIONS GROUP,&nbsp;INC.<BR>  </B></FONT><FONT SIZE=2>(Exact Name of Registrant as specified in its charter) </FONT></P>

<!-- User-specified TAGGED TABLE -->
<TABLE WIDTH="100%" BORDER=0 CELLSPACING=0 CELLPADDING=0>
<TR VALIGN="TOP">
<TD WIDTH="32%" ALIGN="CENTER"><FONT SIZE=2><B>Delaware</B></FONT><FONT SIZE=2><BR>
(State or other jurisdiction of<BR>
incorporation or organization)</FONT></TD>
<TD WIDTH="2%"><FONT SIZE=2>&nbsp;</FONT></TD>
<TD WIDTH="32%" ALIGN="CENTER"><FONT SIZE=2><B>4813</B></FONT><FONT SIZE=2><BR>
(Primary Standard Industrial<BR>
Classification Code Number)</FONT></TD>
<TD WIDTH="2%"><FONT SIZE=2>&nbsp;</FONT></TD>
<TD WIDTH="32%" ALIGN="CENTER"><FONT SIZE=2><B>52-2337274</B></FONT><FONT SIZE=2><BR>
(IRS Employer<BR>
Identification Number)</FONT></TD>
</TR>
</TABLE>
<!-- end of user-specified TAGGED TABLE -->

<P ALIGN="CENTER"><FONT SIZE=2><B>(For Co-Registrants, please see "Table of Co-Registrants" on the following page)  </B></FONT></P>

<P ALIGN="CENTER"><FONT SIZE=2><B> 1015 31<SUP>st</SUP> Street N.W.<BR>
Washington, D.C. 20007<BR>
(202)&nbsp;295-4200<BR>  </B></FONT><FONT SIZE=1>(Address, including zip code, and telephone number, including area code of registrant's principal executive offices) </FONT></P>

<P ALIGN="CENTER"><FONT SIZE=2><B>David Schaeffer<BR>
Chairman and Chief Executive Officer<BR>
Cogent Communications Group,&nbsp;Inc.<BR>
1015 31<SUP>st</SUP> Street N.W.</B></FONT><BR><FONT SIZE=2><B>Washington, D.C. 20007<BR>
(202)&nbsp;295-4200<BR>  </B></FONT><FONT SIZE=1>(Name, address, including zip code and telephone number, including area code of agent for service) </FONT></P>

<P ALIGN="CENTER"><FONT SIZE=2><B>Copies to:  </B></FONT></P>

<P ALIGN="CENTER"><FONT SIZE=2><B> David M. McPherson, Esq.<BR>
Latham&nbsp;&amp; Watkins LLP<BR>
555 11<SUP>th</SUP> Street N.W.<BR>
Washington, D.C. 20004<BR>
(202)&nbsp;637-2200  </B></FONT></P>

<P><FONT SIZE=2><B>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Approximate date of commencement of proposed sale to the public:</B></FONT><FONT SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;From time to time after the effective date of this
Registration Statement. </FONT></P>

<P><FONT SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;If
the only securities being registered on this Form are being offered pursuant to dividend or interest reinvestment plans, please check the following
box:&nbsp;<FONT FACE="WINGDINGS">&#111;</FONT> </FONT></P>

<P><FONT SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;If any of the securities being registered on this Form are to be offered on a delayed or continuous basis pursuant to Rule&nbsp;415 under the Securities Act of
1933, other than securities offered only in connection with dividend or interest reinvestment plans, check the following box:&nbsp;<FONT FACE="WINGDINGS">&#253;</FONT> </FONT></P>

<P><FONT SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;If this Form is filed to register additional securities for an offering pursuant to Rule&nbsp;462(b) under the Securities Act, please check the following box and
list the Securities Act registration statement number of the earlier effective registration statement for the same offering.&nbsp;<FONT FACE="WINGDINGS">&#111;</FONT> </FONT></P>

<P><FONT SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;If this Form is a post-effective amendment filed pursuant to Rule&nbsp;462(c) under the Securities Act, check the following box and list the
Securities Act registration statement number of the earlier effective registration statement for the same offering.&nbsp;<FONT FACE="WINGDINGS">&#111;</FONT> </FONT></P>

<P><FONT SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;If this Form is a registration statement pursuant to General Instruction I.D. or a post-effective amendment thereto that shall become effective upon
filing with the Commission pursuant to Rule&nbsp;462(e) under the Securities Act, check the following box.&nbsp;<FONT FACE="WINGDINGS">&#111;</FONT> </FONT></P>

<P><FONT SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;If this Form is a post-effective amendment to a registration statement filed pursuant to General Instruction I.D. filed to register additional
securities or additional classes of securities pursuant to Rule&nbsp;413(b) under the Securities Act, check the following box.&nbsp;<FONT FACE="WINGDINGS">&#111;</FONT> </FONT></P>

<HR NOSHADE ALIGN="CENTER" WIDTH="120">

<P><FONT SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</FONT><FONT SIZE=2><B>The Registrant hereby amends this Registration Statement on such date or dates as may be necessary to delay its effective date until the
Registrant shall file&nbsp;a further amendment which specifically states that this Registration Statement shall thereafter become effective in accordance with Section&nbsp;8(a) of the Securities
Act of 1933 or until this registration statement shall become effective on such date as the Commission, acting pursuant to said Section&nbsp;8(a), may determine.</B></FONT></P>

<P ALIGN="RIGHT"><FONT SIZE=1><I>continued on the following page  </I></FONT></P>

<P><FONT SIZE=1><I> <hr noshade width=100% align=left size=1>
<hr noshade width=100% align=left size=4>  </I></FONT></P>

<HR NOSHADE>
<P style='page-break-before:always'></p>

<!-- ZEQ.=1,SEQ=1,EFW="2169787",CP="COGENT COMMUNICATIONS GROUP, INC",DN="1",CHK=468440,FOLIO='blank',FILE='DISK124:[06WDC9.06WDC1129]BA1129A.;33',USER='JENGLIS',CD=';1-MAY-2006;14:29' -->

<P><FONT SIZE=1><I>continued from previous page  </I></FONT></P>

<P ALIGN="CENTER">


<FONT SIZE=2><B>TABLE OF CO-REGISTRANTS

 </B></FONT>

</P>

<!-- User-specified TAGGED TABLE -->
<TABLE WIDTH="100%" BORDER=0 CELLSPACING=0 CELLPADDING=0>
<TR VALIGN="BOTTOM">
<TH WIDTH="47%" ALIGN="LEFT"><FONT SIZE=2><B>Exact Name of Registrant as Specified in its Charter<BR> </B></FONT><HR NOSHADE></TH>
<TH WIDTH="2%"><FONT SIZE=2>&nbsp;</FONT></TH>
<TH WIDTH="17%" ALIGN="CENTER"><FONT SIZE=2><B>State of Incorporation<BR>
Or Organization</B></FONT><HR NOSHADE></TH>
<TH WIDTH="2%"><FONT SIZE=2>&nbsp;</FONT></TH>
<TH WIDTH="17%" ALIGN="CENTER"><FONT SIZE=2><B>Primary Standard<BR>
Industry Classification<BR>
Code&nbsp;Numbers</B></FONT><HR NOSHADE></TH>
<TH WIDTH="2%"><FONT SIZE=2>&nbsp;</FONT></TH>
<TH WIDTH="15%" ALIGN="CENTER"><FONT SIZE=2><B>I.R.S. Employer<BR>
Identification<BR>
Number</B></FONT><HR NOSHADE></TH>
</TR>
<TR VALIGN="BOTTOM">
<TD WIDTH="47%"><FONT SIZE=2>Cogent Communications, Inc.</FONT></TD>
<TD WIDTH="2%"><FONT SIZE=2>&nbsp;</FONT></TD>
<TD WIDTH="17%" ALIGN="CENTER"><FONT SIZE=2>Delaware</FONT></TD>
<TD WIDTH="2%"><FONT SIZE=2>&nbsp;</FONT></TD>
<TD WIDTH="17%" ALIGN="RIGHT"><FONT SIZE=2>4813</FONT></TD>
<TD WIDTH="2%"><FONT SIZE=2>&nbsp;</FONT></TD>
<TD WIDTH="15%" ALIGN="RIGHT"><FONT SIZE=2>52-2192026</FONT></TD>
</TR>
<TR VALIGN="BOTTOM">
<TD WIDTH="47%"><FONT SIZE=2>Cogent Communications of California, Inc.</FONT></TD>
<TD WIDTH="2%"><FONT SIZE=2>&nbsp;</FONT></TD>
<TD WIDTH="17%" ALIGN="CENTER"><FONT SIZE=2>Delaware</FONT></TD>
<TD WIDTH="2%"><FONT SIZE=2>&nbsp;</FONT></TD>
<TD WIDTH="17%" ALIGN="RIGHT"><FONT SIZE=2>4813</FONT></TD>
<TD WIDTH="2%"><FONT SIZE=2>&nbsp;</FONT></TD>
<TD WIDTH="15%" ALIGN="RIGHT"><FONT SIZE=2>06-1679580</FONT></TD>
</TR>
<TR VALIGN="BOTTOM">
<TD WIDTH="47%"><FONT SIZE=2>Network Equipment Solutions, LLC</FONT></TD>
<TD WIDTH="2%"><FONT SIZE=2>&nbsp;</FONT></TD>
<TD WIDTH="17%" ALIGN="CENTER"><FONT SIZE=2>Delaware</FONT></TD>
<TD WIDTH="2%"><FONT SIZE=2>&nbsp;</FONT></TD>
<TD WIDTH="17%" ALIGN="RIGHT"><FONT SIZE=2>4813</FONT></TD>
<TD WIDTH="2%"><FONT SIZE=2>&nbsp;</FONT></TD>
<TD WIDTH="15%" ALIGN="RIGHT"><FONT SIZE=2>37-1484154</FONT></TD>
</TR>
<TR VALIGN="BOTTOM">
<TD WIDTH="47%"><FONT SIZE=2>UFO Group, Inc.</FONT></TD>
<TD WIDTH="2%"><FONT SIZE=2>&nbsp;</FONT></TD>
<TD WIDTH="17%" ALIGN="CENTER"><FONT SIZE=2>Delaware</FONT></TD>
<TD WIDTH="2%"><FONT SIZE=2>&nbsp;</FONT></TD>
<TD WIDTH="17%" ALIGN="RIGHT"><FONT SIZE=2>4813</FONT></TD>
<TD WIDTH="2%"><FONT SIZE=2>&nbsp;</FONT></TD>
<TD WIDTH="15%" ALIGN="RIGHT"><FONT SIZE=2>20-1442332</FONT></TD>
</TR>
<TR VALIGN="BOTTOM">
<TD WIDTH="47%"><FONT SIZE=2>Allied Riser Communications Corporation</FONT></TD>
<TD WIDTH="2%"><FONT SIZE=2>&nbsp;</FONT></TD>
<TD WIDTH="17%" ALIGN="CENTER"><FONT SIZE=2>Delaware</FONT></TD>
<TD WIDTH="2%"><FONT SIZE=2>&nbsp;</FONT></TD>
<TD WIDTH="17%" ALIGN="RIGHT"><FONT SIZE=2>4813</FONT></TD>
<TD WIDTH="2%"><FONT SIZE=2>&nbsp;</FONT></TD>
<TD WIDTH="15%" ALIGN="RIGHT"><FONT SIZE=2>75-2789492</FONT></TD>
</TR>
<TR VALIGN="BOTTOM">
<TD WIDTH="47%"><FONT SIZE=2>Allied Riser Operations Corporation</FONT></TD>
<TD WIDTH="2%"><FONT SIZE=2>&nbsp;</FONT></TD>
<TD WIDTH="17%" ALIGN="CENTER"><FONT SIZE=2>Delaware</FONT></TD>
<TD WIDTH="2%"><FONT SIZE=2>&nbsp;</FONT></TD>
<TD WIDTH="17%" ALIGN="RIGHT"><FONT SIZE=2>4813</FONT></TD>
<TD WIDTH="2%"><FONT SIZE=2>&nbsp;</FONT></TD>
<TD WIDTH="15%" ALIGN="RIGHT"><FONT SIZE=2>75-2789494</FONT></TD>
</TR>
<TR VALIGN="BOTTOM">
<TD WIDTH="47%"><FONT SIZE=2>Cogent Communications of D.C., Inc.</FONT></TD>
<TD WIDTH="2%"><FONT SIZE=2>&nbsp;</FONT></TD>
<TD WIDTH="17%" ALIGN="CENTER"><FONT SIZE=2>Delaware</FONT></TD>
<TD WIDTH="2%"><FONT SIZE=2>&nbsp;</FONT></TD>
<TD WIDTH="17%" ALIGN="RIGHT"><FONT SIZE=2>4813</FONT></TD>
<TD WIDTH="2%"><FONT SIZE=2>&nbsp;</FONT></TD>
<TD WIDTH="15%" ALIGN="RIGHT"><FONT SIZE=2>75-2818766</FONT></TD>
</TR>
<TR VALIGN="BOTTOM">
<TD WIDTH="47%"><FONT SIZE=2>Cogent Communications of Florida, Inc.</FONT></TD>
<TD WIDTH="2%"><FONT SIZE=2>&nbsp;</FONT></TD>
<TD WIDTH="17%" ALIGN="CENTER"><FONT SIZE=2>Delaware</FONT></TD>
<TD WIDTH="2%"><FONT SIZE=2>&nbsp;</FONT></TD>
<TD WIDTH="17%" ALIGN="RIGHT"><FONT SIZE=2>4813</FONT></TD>
<TD WIDTH="2%"><FONT SIZE=2>&nbsp;</FONT></TD>
<TD WIDTH="15%" ALIGN="RIGHT"><FONT SIZE=2>75-2841259</FONT></TD>
</TR>
<TR VALIGN="BOTTOM">
<TD WIDTH="47%"><FONT SIZE=2>Cogent Communications of Georgia, Inc.</FONT></TD>
<TD WIDTH="2%"><FONT SIZE=2>&nbsp;</FONT></TD>
<TD WIDTH="17%" ALIGN="CENTER"><FONT SIZE=2>Delaware</FONT></TD>
<TD WIDTH="2%"><FONT SIZE=2>&nbsp;</FONT></TD>
<TD WIDTH="17%" ALIGN="RIGHT"><FONT SIZE=2>4813</FONT></TD>
<TD WIDTH="2%"><FONT SIZE=2>&nbsp;</FONT></TD>
<TD WIDTH="15%" ALIGN="RIGHT"><FONT SIZE=2>75-2818776</FONT></TD>
</TR>
<TR VALIGN="BOTTOM">
<TD WIDTH="47%"><FONT SIZE=2>Cogent Communications of Maryland, Inc.</FONT></TD>
<TD WIDTH="2%"><FONT SIZE=2>&nbsp;</FONT></TD>
<TD WIDTH="17%" ALIGN="CENTER"><FONT SIZE=2>Delaware</FONT></TD>
<TD WIDTH="2%"><FONT SIZE=2>&nbsp;</FONT></TD>
<TD WIDTH="17%" ALIGN="RIGHT"><FONT SIZE=2>4813</FONT></TD>
<TD WIDTH="2%"><FONT SIZE=2>&nbsp;</FONT></TD>
<TD WIDTH="15%" ALIGN="RIGHT"><FONT SIZE=2>75-2841267</FONT></TD>
</TR>
<TR VALIGN="BOTTOM">
<TD WIDTH="47%"><FONT SIZE=2>Cogent Communications of Massachusetts, Inc.</FONT></TD>
<TD WIDTH="2%"><FONT SIZE=2>&nbsp;</FONT></TD>
<TD WIDTH="17%" ALIGN="CENTER"><FONT SIZE=2>Delaware</FONT></TD>
<TD WIDTH="2%"><FONT SIZE=2>&nbsp;</FONT></TD>
<TD WIDTH="17%" ALIGN="RIGHT"><FONT SIZE=2>4813</FONT></TD>
<TD WIDTH="2%"><FONT SIZE=2>&nbsp;</FONT></TD>
<TD WIDTH="15%" ALIGN="RIGHT"><FONT SIZE=2>75-2818774</FONT></TD>
</TR>
<TR VALIGN="BOTTOM">
<TD WIDTH="47%"><FONT SIZE=2>Cogent Communications of Missouri, Inc.</FONT></TD>
<TD WIDTH="2%"><FONT SIZE=2>&nbsp;</FONT></TD>
<TD WIDTH="17%" ALIGN="CENTER"><FONT SIZE=2>Delaware</FONT></TD>
<TD WIDTH="2%"><FONT SIZE=2>&nbsp;</FONT></TD>
<TD WIDTH="17%" ALIGN="RIGHT"><FONT SIZE=2>4813</FONT></TD>
<TD WIDTH="2%"><FONT SIZE=2>&nbsp;</FONT></TD>
<TD WIDTH="15%" ALIGN="RIGHT"><FONT SIZE=2>75-2841272</FONT></TD>
</TR>
<TR VALIGN="BOTTOM">
<TD WIDTH="47%"><FONT SIZE=2>Cogent Communications of New York, Inc.</FONT></TD>
<TD WIDTH="2%"><FONT SIZE=2>&nbsp;</FONT></TD>
<TD WIDTH="17%" ALIGN="CENTER"><FONT SIZE=2>Delaware</FONT></TD>
<TD WIDTH="2%"><FONT SIZE=2>&nbsp;</FONT></TD>
<TD WIDTH="17%" ALIGN="RIGHT"><FONT SIZE=2>4813</FONT></TD>
<TD WIDTH="2%"><FONT SIZE=2>&nbsp;</FONT></TD>
<TD WIDTH="15%" ALIGN="RIGHT"><FONT SIZE=2>75-2818773</FONT></TD>
</TR>
<TR VALIGN="BOTTOM">
<TD WIDTH="47%"><FONT SIZE=2>Cogent Communications of Ohio, Inc.</FONT></TD>
<TD WIDTH="2%"><FONT SIZE=2>&nbsp;</FONT></TD>
<TD WIDTH="17%" ALIGN="CENTER"><FONT SIZE=2>Delaware</FONT></TD>
<TD WIDTH="2%"><FONT SIZE=2>&nbsp;</FONT></TD>
<TD WIDTH="17%" ALIGN="RIGHT"><FONT SIZE=2>4813</FONT></TD>
<TD WIDTH="2%"><FONT SIZE=2>&nbsp;</FONT></TD>
<TD WIDTH="15%" ALIGN="RIGHT"><FONT SIZE=2>75-2818772</FONT></TD>
</TR>
<TR VALIGN="BOTTOM">
<TD WIDTH="47%"><FONT SIZE=2>Cogent Communications of Pennsylvania. Inc.</FONT></TD>
<TD WIDTH="2%"><FONT SIZE=2>&nbsp;</FONT></TD>
<TD WIDTH="17%" ALIGN="CENTER"><FONT SIZE=2>Delaware</FONT></TD>
<TD WIDTH="2%"><FONT SIZE=2>&nbsp;</FONT></TD>
<TD WIDTH="17%" ALIGN="RIGHT"><FONT SIZE=2>4813</FONT></TD>
<TD WIDTH="2%"><FONT SIZE=2>&nbsp;</FONT></TD>
<TD WIDTH="15%" ALIGN="RIGHT"><FONT SIZE=2>75-2818770</FONT></TD>
</TR>
<TR VALIGN="BOTTOM">
<TD WIDTH="47%"><FONT SIZE=2>Cogent Communications of Texas, Inc.</FONT></TD>
<TD WIDTH="2%"><FONT SIZE=2>&nbsp;</FONT></TD>
<TD WIDTH="17%" ALIGN="CENTER"><FONT SIZE=2>Delaware</FONT></TD>
<TD WIDTH="2%"><FONT SIZE=2>&nbsp;</FONT></TD>
<TD WIDTH="17%" ALIGN="RIGHT"><FONT SIZE=2>4813</FONT></TD>
<TD WIDTH="2%"><FONT SIZE=2>&nbsp;</FONT></TD>
<TD WIDTH="15%" ALIGN="RIGHT"><FONT SIZE=2>75-2820271</FONT></TD>
</TR>
<TR VALIGN="BOTTOM">
<TD WIDTH="47%"><FONT SIZE=2>Cogent Communications of Virginia, Inc.</FONT></TD>
<TD WIDTH="2%"><FONT SIZE=2>&nbsp;</FONT></TD>
<TD WIDTH="17%" ALIGN="CENTER"><FONT SIZE=2>Virginia</FONT></TD>
<TD WIDTH="2%"><FONT SIZE=2>&nbsp;</FONT></TD>
<TD WIDTH="17%" ALIGN="RIGHT"><FONT SIZE=2>4813</FONT></TD>
<TD WIDTH="2%"><FONT SIZE=2>&nbsp;</FONT></TD>
<TD WIDTH="15%" ALIGN="RIGHT"><FONT SIZE=2>75-2862729</FONT></TD>
</TR>
<TR VALIGN="BOTTOM">
<TD WIDTH="47%"><FONT SIZE=2>Symposium Gamma, Inc.</FONT></TD>
<TD WIDTH="2%"><FONT SIZE=2>&nbsp;</FONT></TD>
<TD WIDTH="17%" ALIGN="CENTER"><FONT SIZE=2>Delaware</FONT></TD>
<TD WIDTH="2%"><FONT SIZE=2>&nbsp;</FONT></TD>
<TD WIDTH="17%" ALIGN="RIGHT"><FONT SIZE=2>4813</FONT></TD>
<TD WIDTH="2%"><FONT SIZE=2>&nbsp;</FONT></TD>
<TD WIDTH="15%" ALIGN="RIGHT"><FONT SIZE=2>35-2219375</FONT></TD>
</TR>
</TABLE>
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<P style='page-break-before:always'></p>
<!-- ZEQ.=2,SEQ=2,EFW="2169787",CP="COGENT COMMUNICATIONS GROUP, INC",DN="1",CHK=31348,FOLIO='blank',FILE='DISK124:[06WDC9.06WDC1129]BA1129A.;33',USER='JENGLIS',CD=';1-MAY-2006;14:29' -->
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<P><FONT COLOR="#FF4040" SIZE=2><B>The information contained in this prospectus is not complete and may be changed. We may not sell these securities until the registration statement filed with the Securities
and Exchange Commission is effective. This prospectus is not an offer to sell these securities and it is not soliciting an offer to buy these securities in any state where the offer or sale is not
permitted. </B></FONT></P>

<P ALIGN="CENTER">


<FONT COLOR="#FF4040" SIZE=2><B>SUBJECT TO COMPLETION, DATED MAY&nbsp;2, 2006</B></FONT>

</P>

<P><FONT SIZE=2><B> PROSPECTUS  </B></FONT></P>

<P ALIGN="CENTER"><FONT SIZE=2><B>
<IMG SRC="g444640.jpg" ALT="GRAPHIC" WIDTH="243" HEIGHT="91">
  </B></FONT></P>

<P ALIGN="CENTER"><FONT SIZE=4><B>$75,000,000  </B></FONT></P>

<P ALIGN="CENTER"><FONT SIZE=4><B> Debt Securities, Common Stock,<BR>
Preferred Stock and Warrants  </B></FONT></P>

<HR NOSHADE ALIGN="CENTER" WIDTH="120">
<P ALIGN="CENTER"><FONT SIZE=4><B> 16,000,000 Shares<BR>
Common Stock  </B></FONT></P>

<P><FONT SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;We or our majority-owned subsidiaries may from time to time offer up to $75,000,000 in aggregate initial offering price of debt securities, shares
of preferred stock, shares of common stock and debt and equity warrants. Payment obligations under any series of debt securities may be guaranteed, on a joint and several basis, by one or more of the
Registrant or the Co-Registrants. </FONT></P>

<P><FONT SIZE=2>


&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Our common stock is traded on the Nasdaq National Market under the symbol "CCOI." On May&nbsp;1, 2006, the last reported sale price for our common stock on the Nasdaq National Market
was $10.87 per share. We will apply to list any shares of common stock sold under this prospectus and any prospectus supplement on the Nasdaq National Market. We have not determined whether we will
list any other securities we may offer on any exchange or over-the-counter market. If we decide to seek listing of any securities, a prospectus supplement will disclose the
exchange or market.

 </FONT></P>

<P><FONT SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Some
of our stockholders may sell up to 16,000,000 shares of our common stock under this prospectus and any prospectus supplement. In the prospectus supplement relating to sales by
selling stockholders, we will identify each selling stockholder and the number of shares of our common stock that each selling stockholder will be selling. </FONT></P>

<P><FONT SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;When
we offer securities, we will provide specific terms of such securities in supplements to this prospectus. The securities offered by this prospectus and any prospectus supplement may
be offered directly or to or through underwriters or dealers. If any underwriters are involved in the sale of any securities offered by this prospectus and any prospectus supplement, their names, and
any applicable purchase price, fee, commission or discount arrangement between or among them, will be set forth, or will be calculable from the information set forth, in the applicable prospectus
supplement. </FONT></P>

<P><FONT SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;You
should read this prospectus and any prospectus supplement carefully before you invest in any of our securities. </FONT></P>

<HR NOSHADE ALIGN="CENTER" WIDTH="120">

<P><FONT SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</FONT><FONT
SIZE=2><B>Investing in our securities involves risks. Risks associated with an investment in our securities will be described in the applicable prospectus supplement and
certain of our filings with the Securities and Exchange Commission, as described under "Risk Factors" on page&nbsp;1.</B></FONT></P>

<HR NOSHADE ALIGN="CENTER" WIDTH="120">

<P><FONT SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Neither
the Securities and Exchange Commission nor any state securities commission has approved or disapproved of these securities or passed upon the accuracy or adequacy of the
prospectus. Any representation to the contrary is a criminal offense. </FONT></P>

<HR NOSHADE ALIGN="CENTER" WIDTH="120">
<P ALIGN="CENTER"><FONT SIZE=2><B>The date of this prospectus is&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;, 2006.  </B></FONT></P>

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<P style='page-break-before:always'></p>
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<!-- TOC_END -->
<P ALIGN="CENTER"><FONT SIZE=2><A
NAME="bg1129_table_of_contents"> </A>
<A NAME="toc_bg1129_1"> </A>
<BR></FONT><FONT SIZE=2><B>TABLE OF CONTENTS    <BR>    </B></FONT></P>

<!-- User-specified TAGGED TABLE -->
<TABLE WIDTH="100%" BORDER=0 CELLSPACING=0 CELLPADDING=0>
<TR VALIGN="BOTTOM">
<TH WIDTH="92%" ALIGN="LEFT"><FONT SIZE=2>&nbsp;</FONT><BR></TH>
<TH WIDTH="3%"><FONT SIZE=1>&nbsp;</FONT></TH>
<TH WIDTH="5%" ALIGN="CENTER"><FONT SIZE=1><B>Page</B></FONT><HR NOSHADE></TH>
</TR>
<TR VALIGN="TOP">
<TD WIDTH="92%"><FONT SIZE=2>About Cogent</FONT></TD>
<TD WIDTH="3%"><FONT SIZE=2>&nbsp;</FONT></TD>
<TD WIDTH="5%" ALIGN="RIGHT"><FONT SIZE=2>1</FONT></TD>
</TR>
<TR VALIGN="TOP">
<TD WIDTH="92%"><FONT SIZE=2>Risk Factors</FONT></TD>
<TD WIDTH="3%"><FONT SIZE=2>&nbsp;</FONT></TD>
<TD WIDTH="5%" ALIGN="RIGHT"><FONT SIZE=2>1</FONT></TD>
</TR>
<TR VALIGN="TOP">
<TD WIDTH="92%"><FONT SIZE=2>Forward-Looking Statements</FONT></TD>
<TD WIDTH="3%"><FONT SIZE=2>&nbsp;</FONT></TD>
<TD WIDTH="5%" ALIGN="RIGHT"><FONT SIZE=2>1</FONT></TD>
</TR>
<TR VALIGN="TOP">
<TD WIDTH="92%"><FONT SIZE=2>Ratio Of Earnings To Fixed Charges</FONT></TD>
<TD WIDTH="3%"><FONT SIZE=2>&nbsp;</FONT></TD>
<TD WIDTH="5%" ALIGN="RIGHT"><FONT SIZE=2>1</FONT></TD>
</TR>
<TR VALIGN="TOP">
<TD WIDTH="92%"><FONT SIZE=2>Use Of Proceeds</FONT></TD>
<TD WIDTH="3%"><FONT SIZE=2>&nbsp;</FONT></TD>
<TD WIDTH="5%" ALIGN="RIGHT"><FONT SIZE=2>2</FONT></TD>
</TR>
<TR VALIGN="TOP">
<TD WIDTH="92%"><FONT SIZE=2>Selling Stockholders</FONT></TD>
<TD WIDTH="3%"><FONT SIZE=2>&nbsp;</FONT></TD>
<TD WIDTH="5%" ALIGN="RIGHT"><FONT SIZE=2>2</FONT></TD>
</TR>
<TR VALIGN="TOP">
<TD WIDTH="92%"><FONT SIZE=2>Plan of Distribution</FONT></TD>
<TD WIDTH="3%"><FONT SIZE=2>&nbsp;</FONT></TD>
<TD WIDTH="5%" ALIGN="RIGHT"><FONT SIZE=2>2</FONT></TD>
</TR>
<TR VALIGN="TOP">
<TD WIDTH="92%"><FONT SIZE=2>Descriptions of Debt Securities</FONT></TD>
<TD WIDTH="3%"><FONT SIZE=2>&nbsp;</FONT></TD>
<TD WIDTH="5%" ALIGN="RIGHT"><FONT SIZE=2>4</FONT></TD>
</TR>
<TR VALIGN="TOP">
<TD WIDTH="92%"><FONT SIZE=2>Description Of Common Stock</FONT></TD>
<TD WIDTH="3%"><FONT SIZE=2>&nbsp;</FONT></TD>
<TD WIDTH="5%" ALIGN="RIGHT"><FONT SIZE=2>13</FONT></TD>
</TR>
<TR VALIGN="TOP">
<TD WIDTH="92%"><FONT SIZE=2>Description Of Preferred Stock</FONT></TD>
<TD WIDTH="3%"><FONT SIZE=2>&nbsp;</FONT></TD>
<TD WIDTH="5%" ALIGN="RIGHT"><FONT SIZE=2>14</FONT></TD>
</TR>
<TR VALIGN="TOP">
<TD WIDTH="92%"><FONT SIZE=2>Description Of Warrants</FONT></TD>
<TD WIDTH="3%"><FONT SIZE=2>&nbsp;</FONT></TD>
<TD WIDTH="5%" ALIGN="RIGHT"><FONT SIZE=2>17</FONT></TD>
</TR>
<TR VALIGN="TOP">
<TD WIDTH="92%"><FONT SIZE=2>Certain Provisions Of Delaware Law And Of The Company's Charter And Bylaws</FONT></TD>
<TD WIDTH="3%"><FONT SIZE=2>&nbsp;</FONT></TD>
<TD WIDTH="5%" ALIGN="RIGHT"><FONT SIZE=2>17</FONT></TD>
</TR>
<TR VALIGN="TOP">
<TD WIDTH="92%"><FONT SIZE=2>Legal Matters</FONT></TD>
<TD WIDTH="3%"><FONT SIZE=2>&nbsp;</FONT></TD>
<TD WIDTH="5%" ALIGN="RIGHT"><FONT SIZE=2>19</FONT></TD>
</TR>
<TR VALIGN="TOP">
<TD WIDTH="92%"><FONT SIZE=2>Experts</FONT></TD>
<TD WIDTH="3%"><FONT SIZE=2>&nbsp;</FONT></TD>
<TD WIDTH="5%" ALIGN="RIGHT"><FONT SIZE=2>19</FONT></TD>
</TR>
<TR VALIGN="TOP">
<TD WIDTH="92%"><FONT SIZE=2>Where You Can Find More Information</FONT></TD>
<TD WIDTH="3%"><FONT SIZE=2>&nbsp;</FONT></TD>
<TD WIDTH="5%" ALIGN="RIGHT"><FONT SIZE=2>20</FONT></TD>
</TR>
</TABLE>
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<P ALIGN="CENTER"><FONT SIZE=2><A
NAME="bg1129_about_this_prospectus"> </A>
<A NAME="toc_bg1129_2"> </A>
<BR></FONT><FONT SIZE=2><B>ABOUT THIS PROSPECTUS    <BR>    </B></FONT></P>

<P>


<FONT SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;This prospectus is a part of a registration statement that we filed with the Securities and Exchange Commission (the "SEC") utilizing a "shelf" registration
process. Under this shelf registration process, we may sell any combination of the securities described in this prospectus in one or more offerings up to a total dollar amount of $75.0 million. In
addition, some of our stockholders may sell up to 16,000,000 shares of our common stock under our shelf registration statement. This prospectus provides you with a general description of the
securities we or any selling stockholder may offer. Each time we or any selling stockholders sell securities under this shelf registration, we will provide a prospectus supplement that will contain
specific information about the terms of that offering. The prospectus supplement may also add, update or change information contained in this prospectus. You should read both this prospectus and any
prospectus supplement together with additional information described under the heading "Where You Can Find More Information."

 </FONT>

</P>

<P><FONT SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;We
have not authorized any dealer, salesman or other person to give any information or to make any representation other than those contained or incorporated by reference in this
prospectus and the accompanying supplement to this prospectus. You must not rely upon any information or representation not contained or incorporated by reference in this prospectus or the
accompanying prospectus supplement. This prospectus and the accompanying supplement to this prospectus do not constitute an offer to sell or the solicitation of an offer to buy any securities other
than the registered securities to which they relate, nor do this prospectus and the accompanying supplement to this prospectus constitute an offer to sell or the solicitation of an offer to buy
securities in any jurisdiction to any person to whom it is unlawful to make such offer or solicitation in such jurisdiction. You should not assume that the information contained in this prospectus and
the accompanying prospectus supplement is accurate on any date subsequent to the date set forth on the front of the document or that any information we have incorporated by reference is correct on any
date subsequent to the date of the document incorporated by reference, even though this prospectus and any accompanying prospectus supplement is delivered or securities are sold on a later date. </FONT></P>

<P><FONT SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Unless
the context otherwise requires or as otherwise expressly stated, references in this prospectus to "Cogent," "we," "us" and "our" and similar terms refer to Cogent Communications
Group,&nbsp;Inc. and its direct and indirect subsidiaries on a consolidated basis. </FONT></P>

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<P ALIGN="CENTER"><FONT SIZE=2><A
NAME="dc1129_about_cogent"> </A>
<A NAME="toc_dc1129_1"> </A>
<BR></FONT><FONT SIZE=2><B>ABOUT COGENT    <BR>    </B></FONT></P>

<P><FONT SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;We are a leading facilities-based provider of low-cost, high-speed Internet access and Internet Protocol, or IP, communications services.
Our network is specifically designed and optimized to transmit data using IP We deliver our services to small and medium-sized businesses, communications service providers and other
bandwidth-intensive organizations through approximately 10,000 customer connections in North America and Europe. </FONT></P>


<P><FONT SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Our
primary on-net service is Internet access at a speed of 100 Megabits per second, much faster than typical Internet access currently offered to businesses. We offer this
on-net service exclusively through our own facilities, which run all the way to our customers' premises. Because of our integrated network architecture, we are not dependent on local
telephone companies to serve our on-net customers. Our typical customers in multi-tenant office buildings are law firms, financial services firms, advertising and marketing firms and other
professional services businesses. We also provide on-net Internet access at a speed of one Gigabit per second and greater to certain bandwidth-intensive users such as universities, other
ISPs and commercial content providers. </FONT></P>

<P><FONT SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;We
were incorporated in Delaware in August&nbsp;1999. Our principal executive offices are located at 1015 31<SUP>st</SUP> Street N.W., Washington, D.C. 20007. Our telephone number
is (202)&nbsp;295-4200 and our website address is www.cogentco.com. Information contained in our website is not a part of this prospectus. </FONT></P>

<P ALIGN="CENTER"><FONT SIZE=2><A
NAME="dc1129_risk_factors"> </A>
<A NAME="toc_dc1129_2"> </A>
<BR></FONT><FONT SIZE=2><B>RISK FACTORS    <BR>    </B></FONT></P>

<P><FONT SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;You should carefully consider the specific risks set forth under the caption "Risk Factors" in the applicable prospectus supplement and under the caption "Risk
Factors" in any of our filings with the Commission pursuant to Sections 13(a), 13(c), 14, or 15(d) of the Securities Exchange Act of 1934 (the "Exchange Act") incorporated by reference herein, before
making an investment decision. For more information see "Where You Can Find More Information." </FONT></P>

<P ALIGN="CENTER"><FONT SIZE=2><A
NAME="dc1129_forward-looking_statements"> </A>
<A NAME="toc_dc1129_3"> </A>
<BR></FONT><FONT SIZE=2><B>FORWARD-LOOKING STATEMENTS    <BR>    </B></FONT></P>

<P><FONT SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;This prospectus and the documents incorporated by reference into this prospectus contain forward-looking statements that are based on current expectations,
estimates and projections about our industry, management's beliefs, and assumptions made by management. Words such as "anticipates," "expects," "intends," "plans," "believes," "seeks," "estimates,"
and variations of such words and similar expressions are intended to identify such forward-looking statements. These statements are not guarantees of future performance and are subject to certain
risks, uncertainties and assumptions that are difficult to predict; therefore, actual results may differ materially from those expressed or forecasted in any forward-looking statements. The risks and
uncertainties include those noted in "Risk Factors" above and in the documents incorporated by reference. Except as required by law, we undertake no obligation to update publicly any forward-looking
statements, whether as a result of new information, future events or otherwise. </FONT></P>

<P ALIGN="CENTER"><FONT SIZE=2>1</FONT></P>

<HR NOSHADE>
<P style='page-break-before:always'></p>
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<A NAME="page_dc1129_1_2"> </A>
<P ALIGN="CENTER"><FONT SIZE=2><A
NAME="dc1129_ratio_of_earnings_to_fixed_charges"> </A>
<A NAME="toc_dc1129_4"> </A>
<BR></FONT><FONT SIZE=2><B>RATIO OF EARNINGS TO FIXED CHARGES    <BR>    </B></FONT></P>

<P><FONT SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Our ratio of earnings to fixed charges or deficiency of earnings to fixed charges for each of the five fiscal years ended December&nbsp;31, 2001, 2002, 2003,
2004 and 2005 are set forth below. The information set forth below should be read in conjunction with the financial information incorporated by reference herein. </FONT></P>

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<TABLE BORDER=0 CELLSPACING=0 CELLPADDING=0>
<TR VALIGN="BOTTOM">
<TH WIDTH="35%" ALIGN="LEFT"><FONT SIZE=2>&nbsp;</FONT><BR></TH>
<TH WIDTH="2%"><FONT SIZE=1>&nbsp;</FONT></TH>
<TH COLSPAN=2 ALIGN="CENTER"><FONT SIZE=1><B>YEAR<BR>
ENDED<BR>
12/31/2001</B></FONT><HR NOSHADE></TH>
<TH WIDTH="2%"><FONT SIZE=1>&nbsp;</FONT></TH>
<TH COLSPAN=2 ALIGN="CENTER"><FONT SIZE=1><B>YEAR<BR>
ENDED<BR>
12/31/2002</B></FONT><HR NOSHADE></TH>
<TH WIDTH="2%"><FONT SIZE=1>&nbsp;</FONT></TH>
<TH WIDTH="9%" ALIGN="CENTER"><FONT SIZE=1><B>YEAR<BR>
ENDED<BR>
12/31/2003</B></FONT><HR NOSHADE></TH>
<TH WIDTH="2%"><FONT SIZE=1>&nbsp;</FONT></TH>
<TH COLSPAN=2 ALIGN="CENTER"><FONT SIZE=1><B>YEAR<BR>
ENDED<BR>
12/31/2004</B></FONT><HR NOSHADE></TH>
<TH WIDTH="2%"><FONT SIZE=1>&nbsp;</FONT></TH>
<TH COLSPAN=2 ALIGN="CENTER"><FONT SIZE=1><B>YEAR<BR>
ENDED<BR>
12/31/2005</B></FONT><HR NOSHADE></TH>
<TH WIDTH="1%"><FONT SIZE=1>&nbsp;</FONT></TH>
</TR>
<TR VALIGN="BOTTOM">
<TH WIDTH="35%" ALIGN="LEFT"><FONT SIZE=1>&nbsp;</FONT><BR></TH>
<TH WIDTH="2%"><FONT SIZE=1>&nbsp;</FONT></TH>
<TH COLSPAN=13 ALIGN="CENTER"><FONT SIZE=1><B>(000's)<BR> </B></FONT><BR></TH>
<TH WIDTH="1%"><FONT SIZE=1>&nbsp;</FONT></TH>
</TR>
<TR BGCOLOR="#CCEEFF" VALIGN="TOP">
<TD WIDTH="35%"><FONT SIZE=2>Deficiency of earnings to fixed charges</FONT></TD>
<TD WIDTH="2%"><FONT SIZE=2>&nbsp;</FONT></TD>
<TD WIDTH="2%"><FONT SIZE=2>$</FONT></TD>
<TD WIDTH="9%" ALIGN="RIGHT"><FONT SIZE=2>(71,022</FONT></TD>
<TD WIDTH="2%"><FONT SIZE=2>)</FONT></TD>
<TD WIDTH="2%"><FONT SIZE=2>$</FONT></TD>
<TD WIDTH="9%" ALIGN="RIGHT"><FONT SIZE=2>(91,857</FONT></TD>
<TD WIDTH="2%"><FONT SIZE=2>)</FONT></TD>
<TD WIDTH="9%" ALIGN="RIGHT"><FONT SIZE=2>&#151;</FONT></TD>
<TD WIDTH="2%"><FONT SIZE=2>&nbsp;</FONT></TD>
<TD WIDTH="2%"><FONT SIZE=2>$</FONT></TD>
<TD WIDTH="9%" ALIGN="RIGHT"><FONT SIZE=2>(88,772</FONT></TD>
<TD WIDTH="2%"><FONT SIZE=2>)</FONT></TD>
<TD WIDTH="2%"><FONT SIZE=2>$</FONT></TD>
<TD WIDTH="9%" ALIGN="RIGHT"><FONT SIZE=2>(66,633</FONT></TD>
<TD WIDTH="1%"><FONT SIZE=2>)</FONT></TD>
</TR>
<TR VALIGN="TOP">
<TD WIDTH="35%"><FONT SIZE=2>&nbsp;</FONT></TD>
<TD WIDTH="2%"><FONT SIZE=2>&nbsp;</FONT></TD>
<TD COLSPAN=2 ALIGN="RIGHT"><HR NOSHADE SIZE=4></TD>
<TD WIDTH="2%"><FONT SIZE=2>&nbsp;</FONT></TD>
<TD COLSPAN=2 ALIGN="RIGHT"><HR NOSHADE SIZE=4></TD>
<TD WIDTH="2%"><FONT SIZE=2>&nbsp;</FONT></TD>
<TD WIDTH="9%" ALIGN="RIGHT"><HR NOSHADE SIZE=4></TD>
<TD WIDTH="2%"><FONT SIZE=2>&nbsp;</FONT></TD>
<TD COLSPAN=2 ALIGN="RIGHT"><HR NOSHADE SIZE=4></TD>
<TD WIDTH="2%"><FONT SIZE=2>&nbsp;</FONT></TD>
<TD COLSPAN=2 ALIGN="RIGHT"><HR NOSHADE SIZE=4></TD>
<TD WIDTH="1%"><FONT SIZE=2>&nbsp;</FONT></TD>
</TR>
<TR BGCOLOR="White" VALIGN="TOP">
<TD WIDTH="35%"><FONT SIZE=2>Ratio of earnings to fixed charges</FONT></TD>
<TD WIDTH="2%"><FONT SIZE=2>&nbsp;</FONT></TD>
<TD WIDTH="2%"><FONT SIZE=2>&nbsp;</FONT></TD>
<TD WIDTH="9%" ALIGN="RIGHT"><FONT SIZE=2>&nbsp;</FONT></TD>
<TD WIDTH="2%"><FONT SIZE=2>&nbsp;</FONT></TD>
<TD WIDTH="2%"><FONT SIZE=2>&nbsp;</FONT></TD>
<TD WIDTH="9%" ALIGN="RIGHT"><FONT SIZE=2>&nbsp;</FONT></TD>
<TD WIDTH="2%"><FONT SIZE=2>&nbsp;</FONT></TD>
<TD WIDTH="9%" ALIGN="RIGHT"><FONT SIZE=2>8.0</FONT></TD>
<TD WIDTH="2%"><FONT SIZE=2>&nbsp;</FONT></TD>
<TD WIDTH="2%"><FONT SIZE=2>&nbsp;</FONT></TD>
<TD WIDTH="9%"><FONT SIZE=2>&nbsp;</FONT></TD>
<TD WIDTH="2%"><FONT SIZE=2>&nbsp;</FONT></TD>
<TD WIDTH="2%"><FONT SIZE=2>&nbsp;</FONT></TD>
<TD WIDTH="9%"><FONT SIZE=2>&nbsp;</FONT></TD>
<TD WIDTH="1%"><FONT SIZE=2>&nbsp;</FONT></TD>
</TR>
<TR VALIGN="TOP">
<TD WIDTH="35%"><FONT SIZE=2>&nbsp;</FONT></TD>
<TD WIDTH="2%"><FONT SIZE=2>&nbsp;</FONT></TD>
<TD WIDTH="2%"><FONT SIZE=2>&nbsp;</FONT></TD>
<TD WIDTH="9%" ALIGN="RIGHT"><FONT SIZE=2>&nbsp;</FONT></TD>
<TD WIDTH="2%"><FONT SIZE=2>&nbsp;</FONT></TD>
<TD WIDTH="2%"><FONT SIZE=2>&nbsp;</FONT></TD>
<TD WIDTH="9%" ALIGN="RIGHT"><FONT SIZE=2>&nbsp;</FONT></TD>
<TD WIDTH="2%"><FONT SIZE=2>&nbsp;</FONT></TD>
<TD WIDTH="9%" ALIGN="RIGHT"><HR NOSHADE SIZE=4></TD>
<TD WIDTH="2%"><FONT SIZE=2>&nbsp;</FONT></TD>
<TD WIDTH="2%"><FONT SIZE=2>&nbsp;</FONT></TD>
<TD WIDTH="9%" ALIGN="RIGHT"><FONT SIZE=2>&nbsp;</FONT></TD>
<TD WIDTH="2%"><FONT SIZE=2>&nbsp;</FONT></TD>
<TD WIDTH="2%"><FONT SIZE=2>&nbsp;</FONT></TD>
<TD WIDTH="9%"><FONT SIZE=2>&nbsp;</FONT></TD>
<TD WIDTH="1%"><FONT SIZE=2>&nbsp;</FONT></TD>
</TR>
</TABLE>
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<P><FONT SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;For
purposes of computing the deficiency of earnings to fixed charges, earnings consist of income from continuing operations before income taxes plus fixed charges (excluding the effect
of capitalized interest). Fixed charges consist of interest incurred on indebtedness, capitalized interest and estimated interest within rental expense. </FONT></P>

<P ALIGN="CENTER"><FONT SIZE=2><A
NAME="dc1129_use_of_proceeds"> </A>
<A NAME="toc_dc1129_5"> </A>
<BR></FONT><FONT SIZE=2><B>USE OF PROCEEDS    <BR>    </B></FONT></P>

<P><FONT SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;We will use the net proceeds from our sale of the securities for our general corporate purposes, which may include repaying indebtedness, making additions to our
working capital, funding future acquisitions or for any other purpose we describe in the applicable prospectus supplement. We will not receive any of the proceeds from the sale of common stock that
may be sold by selling stockholders. </FONT></P>

<P ALIGN="CENTER"><FONT SIZE=2><A
NAME="dc1129_selling_stockholders"> </A>
<A NAME="toc_dc1129_6"> </A>
<BR></FONT><FONT SIZE=2><B>SELLING STOCKHOLDERS    <BR>    </B></FONT></P>

<P><FONT SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;The selling stockholders may be our directors, executive officers, former directors, employees, former employees or other holders of our common stock. The common
stock to be sold by the selling stockholders was acquired by the selling stockholder upon conversion of participating convertible preferred stock initially issued in various private placements in
March&nbsp;2001, October&nbsp;2001, March&nbsp;2003, July&nbsp;2003, October&nbsp;2003, January&nbsp;2004, March&nbsp;2004, August&nbsp;2004, September&nbsp;2004 and
October&nbsp;2004 or may be acquired after the date hereof by the exercise of options held by certain of our officers and employees. The prospectus supplement for any offering of the common stock by
selling stockholders will include the following information: </FONT></P>

<UL>
<DL compact>
<DT style='margin-bottom:-11pt;'><FONT SIZE=2>&#149;</FONT></DT><DD><FONT SIZE=2>the
names of the selling stockholders;
<BR><BR></FONT></DD><DT style='margin-bottom:-11pt;'><FONT SIZE=2>&#149;</FONT></DT><DD><FONT SIZE=2>the
nature of any position, office or other material relationship which each selling stockholder has had within the last three years with us or any of our predecessors or
affiliates;
<BR><BR></FONT></DD><DT style='margin-bottom:-11pt;'><FONT SIZE=2>&#149;</FONT></DT><DD><FONT SIZE=2>the
number of shares held by each of the selling stockholders before and after the offering;
<BR><BR></FONT></DD><DT style='margin-bottom:-11pt;'><FONT SIZE=2>&#149;</FONT></DT><DD><FONT SIZE=2>the
percentage of the common stock held by each of the selling stockholders before and after the offering; and
<BR><BR></FONT></DD><DT style='margin-bottom:-11pt;'><FONT SIZE=2>&#149;</FONT></DT><DD><FONT SIZE=2>the
number of shares of our common stock offered by each of the selling stockholders. </FONT></DD></DL>
</UL>
<P ALIGN="CENTER"><FONT SIZE=2><A
NAME="dc1129_plan_of_distribution"> </A>
<A NAME="toc_dc1129_7"> </A>
<BR></FONT><FONT SIZE=2><B>PLAN OF DISTRIBUTION    <BR>    </B></FONT></P>

<P><FONT SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;We may sell the securities to one or more underwriters for public offering and sale by them and may also sell the securities to investors directly or through
agents. In addition, some of our stockholders may sell shares of our common stock under this prospectus in any of these ways. We will name any underwriter or agent involved in the offer and sale of
securities in the applicable prospectus supplement. We and any selling stockholders have reserved the right to sell or exchange securities directly to investors on our or their own behalf in those
jurisdictions where we are authorized to do so. </FONT></P>

<P ALIGN="CENTER"><FONT SIZE=2>2</FONT></P>

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<BR>

<P><FONT SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;We
or any selling shareholders may distribute the securities from time to time in one or more transactions: </FONT></P>

<UL>
<DL compact>
<DT style='margin-bottom:-11pt;'><FONT SIZE=2>&#149;</FONT></DT><DD><FONT SIZE=2>at
a fixed price or prices, which may be changed;
<BR><BR></FONT></DD><DT style='margin-bottom:-11pt;'><FONT SIZE=2>&#149;</FONT></DT><DD><FONT SIZE=2>at
market prices prevailing at the time of sale;
<BR><BR></FONT></DD><DT style='margin-bottom:-11pt;'><FONT SIZE=2>&#149;</FONT></DT><DD><FONT SIZE=2>at
prices related to such prevailing market prices; or
<BR><BR></FONT></DD><DT style='margin-bottom:-11pt;'><FONT SIZE=2>&#149;</FONT></DT><DD><FONT SIZE=2>at
negotiated prices. </FONT></DD></DL>
</UL>

<P><FONT SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;The
selling stockholders may also sell shares under Rule&nbsp;144 under the Securities Act of 1933, if available, rather than under this prospectus. </FONT></P>

<P><FONT SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;We
or any selling stockholders may also, from time to time, authorize dealers, acting as our agents, to offer and sell securities upon the terms and conditions set forth in the
applicable prospectus supplement. In connection with the sale of securities, we or any selling stockholders, or the purchasers of securities for whom the underwriters may act as agents, may compensate
underwriters in the form of underwriting discounts or commissions. Underwriters may sell the securities to or through dealers, and those dealers may receive compensation in the form of discounts,
concessions or commissions from the underwriters and/or commissions from the purchasers for whom they may act as agent. Unless otherwise indicated in a prospectus supplement, an agent will be acting
on a best efforts basis and a dealer will purchase securities as a principal, and may then resell the securities at varying prices to be determined by the dealer. </FONT></P>

<P><FONT SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;We
will describe in the applicable prospectus supplement any compensation we or any selling stockholders pay to underwriters or agents in connection with the offering of securities, and
any discounts, concessions or commissions allowed by underwriters to participating dealers. Dealers and agents participating in the distribution of securities may be deemed to be underwriters, and any
discounts and commissions received by them and any profit realized by them on resale of the securities may be deemed to be underwriting discounts and commissions. We or any selling stockholders may
enter into agreements to indemnify underwriters, dealers and agents against certain civil liabilities, including liabilities under the Securities Act, and to reimburse these persons for certain
expenses. </FONT></P>

<P><FONT SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;To
facilitate the offering of securities, certain persons participating in the offering may engage in transactions that stabilize, maintain, or otherwise affect the price of the
securities. This may include over-allotments or short sales of the securities, which involve the sale by persons participating in the offering of more securities than we sold to them. In
these circumstances, these persons would cover such over-allotments or short positions by making purchases in the open market or by exercising their over-allotment option, if
any. In addition, these persons may stabilize or maintain the price of the securities by bidding for or purchasing securities in the open market or by imposing penalty bids, whereby selling
concessions allowed to dealers participating in the offering may be reclaimed if securities sold by them are repurchased in connection with stabilization transactions. The effect of these transactions
may be to stabilize or maintain the market price of the securities at a level above that which might otherwise prevail in the open market. These transactions may be discontinued at any time. </FONT></P>

<P><FONT SIZE=2>


&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;We or the selling stockholders may enter into derivative transactions with third parties, or sell securities not covered by this prospectus to third parties in privately negotiated
transactions. If the applicable prospectus supplement indicates, in connection with any derivative transaction, the third parties may sell securities covered by this prospectus and the applicable
prospectus supplement, including in short sale transactions. If so, the third party may use securities pledged by us or the selling stockholder or borrowed from us or the selling stockholder or others
to settle those sales or to close out any related open borrowings of stock, and may use securities received from us or the selling stockholder in settlement of those derivatives to close out any
related open borrowings of stock. The third party in such sale transactions will be an underwriter and, if not identified in this prospectus, will be identified in the applicable prospectus supplement
or a post-effective amendment to the registration statement of which this prospectus is a part. In addition, we or the selling stockholder may otherwise loan or pledge securities to a
financial institution or other third party that in turn may sell the securities short using this prospectus. Such financial institution or other third party may transfer its economic short position to
investors in our securities or in connection with a concurrent offering of other securities.


</FONT></P>

<P><FONT SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Certain
of the underwriters, dealers or agents and their associates may engage in transactions with and perform services for us in the ordinary course of their business for which they
receive compensation. </FONT></P>

<P ALIGN="CENTER"><FONT SIZE=2>3</FONT></P>

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<P ALIGN="CENTER"><FONT SIZE=2><A
NAME="de1129_description_of_debt_securities"> </A>
<A NAME="toc_de1129_1"> </A>
<BR></FONT><FONT SIZE=2><B>DESCRIPTION OF DEBT SECURITIES    <BR>    </B></FONT></P>

<P><FONT SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;This prospectus describes certain general terms and provisions of our debt securities. When we offer to sell a particular series of debt securities, we will
describe the specific terms of the series in a supplement to this prospectus. We will also indicate in the applicable prospectus supplement whether the general terms and provisions described in this
prospectus apply to a particular series of debt securities. </FONT></P>

<P><FONT SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;We
may offer under this prospectus up to $75,000,000 aggregate principal amount of debt securities, or if debt securities are issued at a discount, or in a foreign currency or composite
currency, such principal amount as may be sold for a public offering price of up to $75,000,000. Unless otherwise specified in a supplement to this prospectus, the debt securities will be our direct,
unsecured obligations and will rank equally with all of our other unsecured and unsubordinated indebtedness. </FONT></P>


<P><FONT SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;The
debt securities will be issued under an indenture between us and a trustee, as trustee. We have summarized select portions of the indenture below. The summary is not complete. The
form of the indenture has been filed as an exhibit to the registration statement and you should read the indenture for provisions that may be important to you. Capitalized terms used in the summary
have the meaning specified in the indenture. </FONT></P>

<P><FONT SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;When
we refer to "we," "our" and "us" in this section, we mean Cogent Communications Group,&nbsp;Inc. excluding, unless the context otherwise requires or as otherwise expressly stated,
our subsidiaries. </FONT></P>

<P><FONT SIZE=2><B>General  </B></FONT></P>

<P><FONT SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;The terms of each series of debt securities will be established by or pursuant to a resolution of our Board of Directors and set forth or determined in the manner
provided in an officers' certificate or by a supplemental indenture. The particular terms of each series of debt securities will be described in a prospectus supplement relating to such series
including any pricing supplement. </FONT></P>

<P><FONT SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;We
can issue an unlimited amount of debt securities under the indenture that may be in one or more series with the same or various maturities, at par, at a premium, or at a discount. We
will set forth in a prospectus supplement, including any pricing supplement, relating to any series of debt securities being offered, the aggregate principal amount and the following terms of the debt
securities: </FONT></P>

<UL>
<DL compact>
<DT style='margin-bottom:-11pt;'><FONT SIZE=2>&#149;</FONT></DT><DD><FONT SIZE=2>the
title of the debt securities;
<BR><BR></FONT></DD><DT style='margin-bottom:-11pt;'><FONT SIZE=2>&#149;</FONT></DT><DD><FONT SIZE=2>the
price or prices (expressed as a percentage of the principal amount) at which we will sell the debt securities;
<BR><BR></FONT></DD><DT style='margin-bottom:-11pt;'><FONT SIZE=2>&#149;</FONT></DT><DD><FONT SIZE=2>any
limit on the aggregate principal amount of the debt securities;
<BR><BR></FONT></DD><DT style='margin-bottom:-11pt;'><FONT SIZE=2>&#149;</FONT></DT><DD><FONT SIZE=2>the
date or dates on which we will pay the principal on the debt securities;
<BR><BR></FONT></DD><DT style='margin-bottom:-11pt;'><FONT SIZE=2>&#149;</FONT></DT><DD><FONT SIZE=2>the
rate or rates (which may be fixed or variable) per annum or the method used to determine the rate or rates (including any commodity, commodity index, stock exchange
index or financial index) at which the debt securities will bear interest, the date or dates from which interest will accrue, the date or dates on which interest will commence and be payable and any
regular record date for the interest payable on any interest payment date;
<BR><BR></FONT></DD><DT style='margin-bottom:-11pt;'><FONT SIZE=2>&#149;</FONT></DT><DD><FONT SIZE=2>whether
the debt securities rank as senior subordinated debt securities or subordinated debt securities, or any combination thereof;
<BR><BR></FONT></DD><DT style='margin-bottom:-11pt;'><FONT SIZE=2>&#149;</FONT></DT><DD><FONT SIZE=2>the
form and terms of any guarantee of any debt securities; </FONT></DD></DL>
</UL>
<P ALIGN="CENTER"><FONT SIZE=2>4</FONT></P>

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<UL>
<UL>
</UL>
<DL compact>
<DT style='margin-bottom:-11pt;'><FONT SIZE=2>&#149;</FONT></DT><DD><FONT SIZE=2>whether,
the ratio at which and the terms and conditions upon which, if any, the debt securities will be convertible into or exchangeable for our common stock or our other
securities or securities of another person;
<BR><BR></FONT></DD><DT style='margin-bottom:-11pt;'><FONT SIZE=2>&#149;</FONT></DT><DD><FONT SIZE=2>the
place or places where principal of, premium, if any, and interest, if any, on the debt securities will be payable or the method of such payment, if by wire transfer,
mail or other means;
<BR><BR></FONT></DD><DT style='margin-bottom:-11pt;'><FONT SIZE=2>&#149;</FONT></DT><DD><FONT SIZE=2>the
terms and conditions upon which we may redeem the debt securities;
<BR><BR></FONT></DD><DT style='margin-bottom:-11pt;'><FONT SIZE=2>&#149;</FONT></DT><DD><FONT SIZE=2>any
obligation we have to redeem or purchase the debt securities pursuant to any sinking fund or analogous provisions or at the option of a holder of debt securities;
<BR><BR></FONT></DD><DT style='margin-bottom:-11pt;'><FONT SIZE=2>&#149;</FONT></DT><DD><FONT SIZE=2>the
dates on which and the price or prices at which we will repurchase debt securities at the option of the holders of debt securities and other detailed terms and
provisions of these repurchase obligations;
<BR><BR></FONT></DD><DT style='margin-bottom:-11pt;'><FONT SIZE=2>&#149;</FONT></DT><DD><FONT SIZE=2>the
denominations in which the debt securities will be issued, if other than denominations of $1,000 and any integral multiple thereof;
<BR><BR></FONT></DD><DT style='margin-bottom:-11pt;'><FONT SIZE=2>&#149;</FONT></DT><DD><FONT SIZE=2>whether
the debt securities will be issued in bearer or fully registered form (and if in fully registered form, whether the debt securities will be issuable, in whole or in
part, as global debt securities);
<BR><BR></FONT></DD><DT style='margin-bottom:-11pt;'><FONT SIZE=2>&#149;</FONT></DT><DD><FONT SIZE=2>the
portion of principal amount of the debt securities payable upon declaration of acceleration of the maturity date, if other than the principal amount;
<BR><BR></FONT></DD><DT style='margin-bottom:-11pt;'><FONT SIZE=2>&#149;</FONT></DT><DD><FONT SIZE=2>the
currency of denomination of the debt securities;
<BR><BR></FONT></DD><DT style='margin-bottom:-11pt;'><FONT SIZE=2>&#149;</FONT></DT><DD><FONT SIZE=2>the
designation of the currency, currencies or currency units in which payment of principal of, premium and interest on the debt securities will be made;
<BR><BR></FONT></DD><DT style='margin-bottom:-11pt;'><FONT SIZE=2>&#149;</FONT></DT><DD><FONT SIZE=2>if
payments of principal of, premium or interest on the debt securities will be made in one or more currencies or currency units other than that or those in which the debt
securities are denominated, the manner in which the exchange rate with respect to these payments will be determined;
<BR><BR></FONT></DD><DT style='margin-bottom:-11pt;'><FONT SIZE=2>&#149;</FONT></DT><DD><FONT SIZE=2>the
manner in which the amounts of payment of principal of, premium or interest on the debt securities will be determined, if these amounts may be determined by reference to
an index based on a currency or currencies other than that in which the debt securities are denominated or designated to be payable or by reference to a commodity, commodity index, stock exchange
index or financial index;
<BR><BR></FONT></DD><DT style='margin-bottom:-11pt;'><FONT SIZE=2>&#149;</FONT></DT><DD><FONT SIZE=2>any
provisions relating to any security provided for the debt securities;
<BR><BR></FONT></DD><DT style='margin-bottom:-11pt;'><FONT SIZE=2>&#149;</FONT></DT><DD><FONT SIZE=2>any
addition to or change in the events of default described in this prospectus or in the indenture with respect to the debt securities and any change in the acceleration
provisions described in this prospectus or in the indenture with respect to the debt securities;
<BR><BR></FONT></DD><DT style='margin-bottom:-11pt;'><FONT SIZE=2>&#149;</FONT></DT><DD><FONT SIZE=2>any
addition to, change in, or deletion from, the covenants described in this prospectus or in the indenture with respect to the debt securities;
<BR><BR></FONT></DD><DT style='margin-bottom:-11pt;'><FONT SIZE=2>&#149;</FONT></DT><DD><FONT SIZE=2>any
other terms of the debt securities, which may modify, supplement or delete any provision of the indenture as it applies to that series; and
<BR><BR></FONT></DD><DT style='margin-bottom:-11pt;'><FONT SIZE=2>&#149;</FONT></DT><DD><FONT SIZE=2>any
depositaries, interest rate calculation agents, exchange rate calculation agents or other agents with respect to the debt securities. </FONT></DD></DL>
</UL>
<P ALIGN="CENTER"><FONT SIZE=2>5</FONT></P>

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<P><FONT SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;In
addition, the indenture does not limit our ability to issue subordinated debt securities. Any subordination provisions of a particular series of debt securities will be set forth in
the officer's certificate or supplemental indenture related to that series of debt securities and will be described in the relevant prospectus supplement. </FONT></P>

<P><FONT SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;We
may issue debt securities that provide for an amount less than their stated principal amount to be due and payable upon declaration of acceleration of their maturity pursuant to the
terms of the indenture. We will provide you with information on the federal income tax considerations and other special considerations applicable to any of these debt securities in the applicable
prospectus supplement. </FONT></P>

<P><FONT SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;If
we denominate the purchase price of any of the debt securities in a foreign currency or currencies or a foreign currency unit or units, or if the principal of and any premium and
interest on any series of debt securities is payable in a foreign currency or currencies or a foreign currency unit or units, we will provide you with information on the restrictions, elections,
general tax considerations, specific terms and other information with respect to that issue of debt securities and such foreign currency or currencies or foreign currency unit or units in the
applicable prospectus supplement. </FONT></P>

<P><FONT SIZE=2><B>Transfer and Exchange  </B></FONT></P>

<P><FONT SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Each debt security will be represented by either one or more global securities registered in the name of The Depository Trust Company, as depositary, or a nominee
(we will refer to any debt security represented by a global debt security as a "book-entry debt security"), or a certificate issued in definitive registered form (we will refer to any debt
security represented by a certificated security as a "certificated debt security") as set forth in the applicable prospectus supplement. Except as set forth under the heading "Global Debt Securities
and Book-Entry System" below, book-entry debt securities will not be issuable in certificated form. </FONT></P>


<P><FONT SIZE=2><B><I>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Certificated Debt Securities.</I></B></FONT><FONT SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;You may transfer or exchange certificated debt securities at any office
we maintain for this purpose in accordance with the terms of the indenture. No service charge will be made for any transfer or exchange of certificated debt securities, but we may require payment of a
sum
sufficient to cover any tax or other governmental charge payable in connection with a transfer or exchange. </FONT></P>

<P><FONT SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;You
may effect the transfer of certificated debt securities and the right to receive the principal of, premium and interest on certificated debt securities only by surrendering the
certificate representing those certificated debt securities and either reissuance by us or the trustee of the certificate to the new holder or the issuance by us or the trustee of a new certificate to
the new holder. </FONT></P>

<P><FONT SIZE=2><B><I>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Global Debt Securities and Book-Entry System.</I></B></FONT><FONT SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;Each global debt security representing
book-entry debt securities will be deposited with, or on behalf of, the depositary, and registered in the name of the depositary or a nominee of the depositary. </FONT></P>

<P><FONT SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;We
anticipate that the depositary will follow the following procedures with respect to book-entry debt securities. </FONT></P>


<P><FONT SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Ownership
of beneficial interests in book-entry debt securities will be limited to persons that have accounts with the depositary for the related global debt security, which
we refer to as participants, or persons that may hold interests through participants. Upon the issuance of a global debt security, the depositary will credit, on its book-entry
registration and transfer system, the participants' accounts with the respective principal amounts of the book-entry debt securities represented by such global debt security beneficially
owned by such participants. The accounts to be credited will be designated by any dealers, underwriters or agents participating in the distribution of the book-entry debt securities.
Ownership of book-entry debt securities will be shown on, and the transfer of such ownership interests will be effected only through, records maintained by the depositary for the related
global debt security </FONT></P>

<P ALIGN="CENTER"><FONT SIZE=2>6</FONT></P>

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<P><FONT SIZE=2>(with
respect to interests of participants) and on the records of participants (with respect to interests of persons holding through participants). The laws of some states may require that certain
purchasers of securities take physical delivery of such securities in definitive form. These laws may impair the ability to own, transfer or pledge beneficial interests in book-entry debt
securities. </FONT></P>

<P><FONT SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;So
long as the depositary for a global debt security, or its nominee, is the registered owner of that global debt security, the depositary or its nominee, as the case may be, will be
considered the sole owner or holder of the book-entry debt securities represented by such global debt security for all purposes under the indenture. Except as described below, beneficial
owners of book-entry debt securities will not be entitled to have securities registered in their names, will not receive or be entitled to receive physical delivery of a certificate in
definitive form representing securities and will not be considered the owners or holders of those securities under the indenture. Accordingly, each person beneficially owning book-entry
debt securities must
rely on the procedures of the depositary for the related global debt security and, if such person is not a participant, on the procedures of the participant through which such person owns its
interest, to exercise any rights of a holder under the indenture. </FONT></P>

<P><FONT SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;We
understand, however, that under existing industry practice, the depositary will authorize the persons on whose behalf it holds a global debt security to exercise certain rights of
holders of debt securities, and the indenture provides that we, the trustee and our respective agents will treat as the holder of a debt security the persons specified in a written statement of the
depositary with respect to that global debt security for purposes of obtaining any consents or directions required to be given by holders of the debt securities pursuant to the indenture. </FONT></P>


<P><FONT SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;We
will make payments of principal of, and premium and interest on book-entry debt securities to the depositary or its nominee, as the case may be, as the registered holder
of the related global debt security. We, the trustee and any other agent of ours or agent of the trustee will not have any responsibility or liability for any aspect of the records relating to or
payments made on account of beneficial ownership interests in a global debt security or for maintaining, supervising or reviewing any records relating to beneficial ownership interests. </FONT></P>

<P><FONT SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;We
expect that the depositary, upon receipt of any payment of principal of, premium or interest on a global debt security, will immediately credit participants' accounts with payments in
amounts proportionate to the respective amounts of book-entry debt securities held by each participant as shown on the records of such depositary. We also expect that payments by
participants to owners of beneficial interests in book-entry debt securities held through those participants will be governed by standing customer instructions and customary practices, as
is now the case with the securities held for the accounts of customers in bearer form or registered in "street name," and will be the responsibility of those participants. </FONT></P>

<P><FONT SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;We
will issue certificated debt securities in exchange for each global debt security if the depositary is at any time unwilling or unable to continue as depositary or ceases to be a
clearing agency registered under the Exchange Act, and a successor depositary registered as a clearing agency under the Exchange Act is not appointed by us within 90&nbsp;days. In addition, we may
at any time and in our sole discretion determine not to have the book-entry debt securities of any series represented by one or more global debt securities and, in that event, will issue
certificated debt securities in exchange for the global debt securities of that series. Global debt securities will also be exchangeable by the holders for certificated debt securities if an event of
default with respect to the book-entry debt securities represented by those global debt securities has occurred and is continuing. Any certificated debt securities issued in exchange for a
global debt security will be registered in such name or names as the depositary shall instruct the trustee. We expect that such instructions will be based upon directions received by the depositary
from participants with respect to ownership of book-entry debt securities relating to such global debt security. </FONT></P>

<P ALIGN="CENTER"><FONT SIZE=2>7</FONT></P>

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<P><FONT SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;We
have obtained the foregoing information concerning the depositary and the depositary's book-entry system from sources we believe to be reliable, but we take no
responsibility for the accuracy of this information. </FONT></P>

<P><FONT SIZE=2><B>Change of Control  </B></FONT></P>

<P><FONT SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Unless we state otherwise in the applicable prospectus supplement, the debt securities will not contain any provisions which may afford holders of the debt
securities protection in the event we have a change in control or in the event of a highly leveraged transaction (whether or not such transaction results in a change in control) which could adversely
affect holders of debt securities. </FONT></P>

<P><FONT SIZE=2><B>Covenants  </B></FONT></P>

<P><FONT SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;We will set forth in the applicable prospectus supplement any restrictive covenants applicable to any issue of debt securities. </FONT></P>

<P><FONT SIZE=2><B>Consolidation, Merger and Sale of Assets  </B></FONT></P>


<P><FONT SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Unless stated otherwise in the applicable prospectus supplement, we may not consolidate with or merge with or into, or convey, transfer or lease all or
substantially all of our properties and assets to, any person, which we refer to as a successor person, unless: </FONT></P>

<UL>
<DL compact>
<DT style='margin-bottom:-11pt;'><FONT SIZE=2>&#149;</FONT></DT><DD><FONT SIZE=2>we
are the surviving corporation or the successor person (if other than Cogent) is a corporation organized and validly existing under the laws of any U.S. domestic
jurisdiction and expressly assumes our obligations on the debt securities and under the indenture;
<BR><BR></FONT></DD><DT style='margin-bottom:-11pt;'><FONT SIZE=2>&#149;</FONT></DT><DD><FONT SIZE=2>immediately
after giving effect to the transaction, no event of default, and no event which, after notice or lapse of time, or both, would become an event of default, shall
have occurred and be continuing under the indenture; and
<BR><BR></FONT></DD><DT style='margin-bottom:-11pt;'><FONT SIZE=2>&#149;</FONT></DT><DD><FONT SIZE=2>certain
other conditions that may be set forth in the applicable prospectus supplement are met. </FONT></DD></DL>
</UL>

<P><FONT SIZE=2><B>Events of Default  </B></FONT></P>

<P><FONT SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Unless otherwise stated in the applicable prospectus supplement, event of default means, with respect to any series of debt securities, any of the following: </FONT></P>

<UL>
<DL compact>
<DT style='margin-bottom:-11pt;'><FONT SIZE=2>&#149;</FONT></DT><DD><FONT SIZE=2>default
in the payment of any interest upon any debt security of that series when it becomes due and payable, and continuance of that default for a period of 30&nbsp;days
(unless the entire amount of the payment is deposited by us with the trustee or with a paying agent prior to the expiration of the 30-day period);
<BR><BR></FONT></DD><DT style='margin-bottom:-11pt;'><FONT SIZE=2>&#149;</FONT></DT><DD><FONT SIZE=2>default
in the payment of principal of or premium on any debt security of that series when due and payable at maturity, upon redemption or otherwise;
<BR><BR></FONT></DD><DT style='margin-bottom:-11pt;'><FONT SIZE=2>&#149;</FONT></DT><DD><FONT SIZE=2>default
in the deposit of any sinking fund payment, when and as due in respect of any debt security of that series;
<BR><BR></FONT></DD><DT style='margin-bottom:-11pt;'><FONT SIZE=2>&#149;</FONT></DT><DD><FONT SIZE=2>default
in the performance or breach of any other covenant or warranty by us in the indenture (other than a covenant or warranty that has been included in the indenture
solely for the benefit of a series of debt securities other than that series), which default continues uncured for a period of 60&nbsp;days after we receive written notice from the trustee or we and
the trustee receive written notice from the holders of not less than a majority in principal amount of the outstanding debt securities of that series as provided in the indenture;
<BR><BR></FONT></DD><DT style='margin-bottom:-11pt;'><FONT SIZE=2>&#149;</FONT></DT><DD><FONT SIZE=2>certain
events of bankruptcy, insolvency or reorganization; and </FONT></DD></DL>
</UL>
<P ALIGN="CENTER"><FONT SIZE=2>8</FONT></P>

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<DL compact>
<DT style='margin-bottom:-11pt;'><FONT SIZE=2>&#149;</FONT></DT><DD><FONT SIZE=2>any
other event of default provided with respect to debt securities of that series that is described in the applicable prospectus supplement accompanying this prospectus. </FONT></DD></DL>
</UL>

<P><FONT SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;No
event of default with respect to a particular series of debt securities (except as to certain events of bankruptcy, insolvency or reorganization) necessarily constitutes an event of
default with respect to any other series of debt securities. The occurrence of an event of default may constitute an event of default under our bank credit agreements in existence from time to time.
In addition, the occurrence of certain events of default or an acceleration under the indenture may constitute an event of default under certain of our other indebtedness outstanding from time to
time. </FONT></P>

<P><FONT SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;If
an event of default with respect to debt securities of any series at the time outstanding occurs and is continuing, then the trustee or the holders of not less than a majority in
principal amount of the outstanding debt securities of that series may, by a notice in writing to us (and to the trustee if given by the holders), declare to be due and payable immediately the
principal (or, if the debt securities of that series are discount securities, that portion of the principal amount as may be specified in the terms of that series) of and accrued and unpaid interest,
if any, on all debt securities of that series. In the case of an event of default resulting from certain events of bankruptcy, insolvency or reorganization, the principal (or such specified amount) of
and accrued and unpaid interest, if any, on all outstanding debt securities will become and be immediately due and payable without any declaration or other act on the part of the trustee or any holder
of outstanding debt securities. At any time after a declaration of acceleration with respect to debt securities of any series has been made, but before a judgment or decree for payment of the money
due has been obtained by the trustee, the holders of a majority in principal amount of the outstanding debt securities of that series may rescind and annul the acceleration if all events of default,
other than the non-payment of accelerated principal and interest, if any, with respect to debt securities of that series, have been cured or waived as provided in the indenture. We refer
you to the prospectus supplement relating to any series of debt securities that are discount securities for the particular provisions relating to acceleration of a portion of the principal amount of
such discount securities upon the occurrence of an event of default. </FONT></P>

<P><FONT SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;The
indenture provides that the trustee will be under no obligation to exercise any of its rights or powers under the indenture at the request of any holder of outstanding debt
securities, unless the trustee receives indemnity satisfactory to it against any loss, liability or expense. Subject to certain rights of the trustee, the holders of a majority in principal amount of
the outstanding debt securities of any series will have the right to direct the time, method and place of conducting any proceeding for any remedy available to the trustee or exercising any trust or
power conferred on the trustee with respect to the debt securities of that series. </FONT></P>

<P><FONT SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Unless
stated otherwise in the applicable prospectus supplement, no holder of any debt security of any series will have any right to institute any proceeding, judicial or otherwise, with
respect to the indenture or for the appointment of a receiver or trustee, or for any remedy under the indenture, unless: </FONT></P>

<UL>
<DL compact>
<DT style='margin-bottom:-11pt;'><FONT SIZE=2>&#149;</FONT></DT><DD><FONT SIZE=2>that
holder has previously given to the trustee written notice of a continuing event of default with respect to debt securities of that series; and
<BR><BR></FONT></DD><DT style='margin-bottom:-11pt;'><FONT SIZE=2>&#149;</FONT></DT><DD><FONT SIZE=2>the
holders of at least a majority in principal amount of the outstanding debt securities of that series have made written request, and offered reasonable indemnity, to the
trustee to institute the proceeding as trustee, and the trustee has not received from the holders of a majority in principal amount of the outstanding debt securities of that series&nbsp;a direction
inconsistent with that request and has failed to institute the proceeding within 60&nbsp;days. </FONT></DD></DL>
</UL>

<P><FONT SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Notwithstanding
the foregoing, the holder of any debt security will have an absolute and unconditional right to receive payment of the principal of, premium and any interest on that debt </FONT></P>

<P ALIGN="CENTER"><FONT SIZE=2>9</FONT></P>

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<P><FONT SIZE=2>security
on or after the due dates expressed in that debt security and to institute suit for the enforcement of payment. </FONT></P>

<P><FONT SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;The
indenture requires us, within 120&nbsp;days after the end of our fiscal year, to furnish to the trustee a statement as to compliance with the indenture. The indenture provides that
the trustee may withhold notice to the holders of debt securities of any series of any default or event of default (except in payment on any debt securities of that series) with respect to debt
securities of that series if it in good faith determines that withholding notice is in the interest of the holders of those debt securities. </FONT></P>

<P><FONT SIZE=2><B>Modification and Waiver  </B></FONT></P>

<P><FONT SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;We may modify and amend the indenture with the consent of the holders of at least a majority in principal amount of the outstanding debt securities of each series
affected by the modifications or amendments. We may not make any modification or amendment without the consent of the holders of each affected debt security then outstanding if that amendment will: </FONT></P>

<UL>
<DL compact>
<DT style='margin-bottom:-11pt;'><FONT SIZE=2>&#149;</FONT></DT><DD><FONT SIZE=2>reduce
the amount of debt securities whose holders must consent to an amendment or waiver;
<BR><BR></FONT></DD><DT style='margin-bottom:-11pt;'><FONT SIZE=2>&#149;</FONT></DT><DD><FONT SIZE=2>reduce
the rate of or extend the time for payment of interest (including default interest) on any debt security;
<BR><BR></FONT></DD><DT style='margin-bottom:-11pt;'><FONT SIZE=2>&#149;</FONT></DT><DD><FONT SIZE=2>reduce
the principal of or premium on or change the fixed maturity of any debt security or reduce the amount of, or postpone the date fixed for, the payment of any sinking
fund or analogous obligation with respect to any series of debt securities;
<BR><BR></FONT></DD><DT style='margin-bottom:-11pt;'><FONT SIZE=2>&#149;</FONT></DT><DD><FONT SIZE=2>reduce
the principal amount of discount securities payable upon acceleration of maturity;
<BR><BR></FONT></DD><DT style='margin-bottom:-11pt;'><FONT SIZE=2>&#149;</FONT></DT><DD><FONT SIZE=2>waive
a default in the payment of the principal of, premium or interest on any debt security (except a rescission of acceleration of the debt securities of any series by the
holders of at least a majority in aggregate principal amount of the then outstanding debt securities of that series and a waiver of the payment default that resulted from such acceleration);
<BR><BR></FONT></DD><DT style='margin-bottom:-11pt;'><FONT SIZE=2>&#149;</FONT></DT><DD><FONT SIZE=2>make
the principal of or premium or interest on any debt security payable in currency other than that stated in the debt security;
<BR><BR></FONT></DD><DT style='margin-bottom:-11pt;'><FONT SIZE=2>&#149;</FONT></DT><DD><FONT SIZE=2>make
any change to certain provisions of the indenture relating to, among other things, the right of holders of debt securities to receive payment of the principal of,
premium and interest on those debt securities and to institute suit for the enforcement of any such payment and to waivers or amendments; or
<BR><BR></FONT></DD><DT style='margin-bottom:-11pt;'><FONT SIZE=2>&#149;</FONT></DT><DD><FONT SIZE=2>waive
a redemption payment with respect to any debt security. </FONT></DD></DL>
</UL>
<BR>

<P><FONT SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Except
for certain specified provisions, the holders of at least a majority in principal amount of the outstanding debt securities of any series may on behalf of the holders of all debt
securities of that series waive our compliance with provisions of the indenture. The holders of a majority in principal amount of the outstanding debt securities of any series may on behalf of the
holders of all the debt securities of such series waive any past default under the indenture with respect to that series and its consequences, except a default in the payment of the principal of,
premium or any interest on any debt security of that series or in respect of a covenant or provision which cannot be modified or amended without the consent of the holder of each outstanding debt
security of the series affected; provided, however, that the holders of a majority in principal amount of the outstanding debt securities of any series may rescind an acceleration and its
consequences, including any related payment default that resulted from the acceleration. </FONT></P>

<P ALIGN="CENTER"><FONT SIZE=2>10</FONT></P>

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<P><FONT SIZE=2><B>Defeasance of Debt Securities and Certain Covenants in Certain Circumstances  </B></FONT></P>

<P><FONT SIZE=2><B><I>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Legal Defeasance.</I></B></FONT><FONT SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;The indenture provides that, unless otherwise provided by the terms of the
applicable series of debt securities, we may be discharged from any and all obligations in respect of the debt securities of any series (except for certain obligations to register the transfer or
exchange of debt securities of such series, to replace stolen, lost or mutilated debt securities of such series, and to maintain paying agencies and certain provisions relating to the treatment of
funds held by paying agents). We will be so discharged upon the deposit with the trustee, in trust, of money and/or U.S. government obligations or, in the case of debt securities denominated in a
single currency other than U.S. dollars, foreign government obligations, that, through the payment of interest and principal in accordance with their terms, will provide money in an amount sufficient
in the opinion of a nationally recognized firm of independent public accountants to pay and discharge each installment of principal, premium and interest on and any mandatory sinking fund payments in
respect of the debt securities of that series on the stated maturity of those payments in accordance with the terms of the indenture and those debt securities. </FONT></P>


<P><FONT SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;This
discharge may occur only if, among other things, we have delivered to the trustee an opinion of counsel stating that we have received from, or there has been published by, the
United States Internal Revenue Service a ruling or, since the date of execution of the indenture, there has been a change in the applicable United States federal income tax law, in either case to the
effect that, and based thereon such opinion shall confirm that, the holders of the debt securities of that series will not recognize income, gain or loss for United States federal income tax purposes
as a result of the deposit, defeasance and discharge and will be subject to United States federal income tax on the same amounts and in the same manner and at the same times as would have been the
case if the deposit, defeasance and discharge had not occurred. </FONT></P>

<P><FONT SIZE=2><B><I>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Defeasance of Certain Covenants.</I></B></FONT><FONT SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;The indenture provides that, unless otherwise provided by the terms
of the applicable series of debt securities, upon compliance with certain conditions: </FONT></P>

<UL>
<DL compact>
<DT style='margin-bottom:-11pt;'><FONT SIZE=2>&#149;</FONT></DT><DD><FONT SIZE=2>we
may omit to comply with the covenant described under the heading "Consolidation, Merger and Sale of Assets" and certain other covenants set forth in the indenture, as
well as any additional covenants which may be set forth in the applicable prospectus supplement; and
<BR><BR></FONT></DD><DT style='margin-bottom:-11pt;'><FONT SIZE=2>&#149;</FONT></DT><DD><FONT SIZE=2>any
omission to comply with those covenants will not constitute a default or an event of default with respect to the debt securities of that series, or covenant defeasance. </FONT></DD></DL>
</UL>

<P><FONT SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;The
conditions include: </FONT></P>

<UL>
<DL compact>
<DT style='margin-bottom:-11pt;'><FONT SIZE=2>&#149;</FONT></DT><DD><FONT SIZE=2>depositing
with the trustee money and/or U.S. government obligations or, in the case of debt securities denominated in a single currency other than U.S. dollars, foreign
government obligations, that, through the payment of interest and principal in accordance with their terms, will provide money in an amount sufficient in the opinion of a nationally recognized firm of
independent public accountants to pay and discharge each installment of principal of, premium and interest on and any mandatory sinking fund payments in respect of the debt securities of that series
on the stated maturity of those payments in accordance with the terms of the indenture and those debt securities; and
<BR><BR></FONT></DD><DT style='margin-bottom:-11pt;'><FONT SIZE=2>&#149;</FONT></DT><DD><FONT SIZE=2>delivering
to the trustee an opinion of counsel to the effect that the holders of the debt securities of that series will not recognize income, gain or loss for United
States federal income tax purposes as a result of the deposit and related covenant defeasance and will be subject to United States federal income tax on the same amounts and in the same manner and at
the same times as would have been the case if the deposit and related covenant defeasance had not occurred. </FONT></DD></DL>
</UL>
<P ALIGN="CENTER"><FONT SIZE=2>11</FONT></P>

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</UL>
</UL>

<P><FONT SIZE=2><B><I>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Covenant Defeasance and Events of Default.</I></B></FONT><FONT SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;In the event we exercise our option to effect covenant
defeasance with respect to any series of debt securities and the debt securities of that series are declared due and payable because of the occurrence of any event of default, the amount of money
and/or U.S. government obligations or foreign government obligations on deposit with the trustee will be sufficient to pay amounts due on the debt securities of that series at the time of their stated
maturity but may not be sufficient to pay amounts due on the debt securities of that series at the time of the acceleration resulting from the event of default. However, we shall remain liable for
those payments. </FONT></P>

<P><FONT SIZE=2><B>Guarantees  </B></FONT></P>

<P><FONT SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Our payment obligations under any series of debt securities may be guaranteed by one or more of the Co-Registrants. The terms of any such guarantee
will be set forth in the applicable prospectus supplement. </FONT></P>

<P ALIGN="CENTER"><FONT SIZE=2>12</FONT></P>

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<P ALIGN="CENTER"><FONT SIZE=2><A
NAME="dg1129_description_of_common_stock"> </A>
<A NAME="toc_dg1129_1"> </A>
<BR></FONT><FONT SIZE=2><B>DESCRIPTION OF COMMON STOCK    <BR>    </B></FONT></P>

<P>


<FONT SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;The following description of our common stock is only a summary. We encourage you to read our amended and restated certificate of incorporation, which is
incorporated into the registration statement of which this prospectus forms a part. As of the date of this prospectus, we are authorized to issue up to 75,000,000 shares of common stock, par value
$0.001 per share. As of March&nbsp;31, 2006, we had outstanding 44,128,897 shares of our common stock.

 </FONT>

</P>

<P><FONT SIZE=2><B>Liquidation Rights  </B></FONT></P>


<P><FONT SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Upon voluntary or involuntary liquidation, dissolution or winding up, the holders of our common stock share ratably in the assets remaining after payments to
creditors and provision for the preference of any preferred stock. </FONT></P>

<P><FONT SIZE=2><B>Dividends  </B></FONT></P>

<P><FONT SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Except as otherwise provided by the Delaware General Corporation Law or our amended and restated certificate of incorporation, the holders of our common stock,
subject to the rights of holders of any series of preferred stock, share ratably in all dividends as may from time to time be declared by our board of directors in respect of our common stock out of
funds legally available for the payment thereof and payable in cash, stock or otherwise, and in all other distributions (including, without limitation, our dissolution, liquidation and winding up),
whether in respect of liquidation or dissolution (voluntary or involuntary) or otherwise, after payment of liabilities and liquidation preference on any outstanding preferred stock. </FONT></P>

<P><FONT SIZE=2><B>Voting Rights  </B></FONT></P>

<P><FONT SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Except as otherwise provided by the Delaware General Corporation Law or our certificate of incorporation and subject to the rights of holders of any series of
preferred stock, all the voting power of our stockholders shall be vested in the holders of our common stock and preferred stock, and each holder of our common stock and preferred stock shall have one
vote for each share held by such holder (in the case of preferred stock, on an as converted to common stock basis) on all matters voted upon by our stockholders. </FONT></P>

<P><FONT SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Our
stockholders may act by written consent in lieu of a meeting as permitted by Delaware General Corporation Law. </FONT></P>

<P><FONT SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;The
affirmative vote of holders of at least a majority of the combined voting power of our outstanding shares eligible to vote in the election of directors is required to remove
directors from office. </FONT></P>

<P><FONT SIZE=2><B>Miscellaneous  </B></FONT></P>

<P><FONT SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Our common stock is not convertible into, or exchangeable for, any other class or series of our capital stock. Holders of our common stock have no preemptive or
other rights to subscribe for or purchase additional securities of ours. Shares of our common stock are not subject to calls or assessments. All of the outstanding shares of our common stock are fully
paid and nonassessable. The transfer agent and registrar for our common stock is Registrar and Transfer Company. Our common stock is listed and traded on the Nasdaq National Market under the
symbol&nbsp;"CCOI." </FONT></P>

<P ALIGN="CENTER"><FONT SIZE=2>13</FONT></P>

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<P ALIGN="CENTER"><FONT SIZE=2><A
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<A NAME="toc_dg1129_2"> </A>
<BR></FONT><FONT SIZE=2><B>DESCRIPTION OF PREFERRED STOCK    <BR>    </B></FONT></P>

<P><FONT SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;The following briefly summarizes the material terms of our preferred stock, other than pricing and related terms that will be disclosed in an accompanying
prospectus supplement. You should read the particular terms of any series of preferred stock offered by us, which will be described in more detail in any prospectus supplement relating to such series,
together with the more detailed provisions of our amended and restated certificate of incorporation and the certificate of designation relating to each
particular series of preferred stock for provisions that may be important to you. The certificate of designation relating to the particular series of preferred stock offered by an accompanying
prospectus supplement and this prospectus will be filed as an exhibit to a document incorporated by reference in the registration statement. The prospectus supplement will also state whether any of
the terms summarized below do not apply to the series of preferred stock being offered. </FONT></P>

<P><FONT SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;As
of the date of this prospectus, we are authorized to issue up to 10,000 shares of preferred stock, par value $0.001 per share, of which, no shares of preferred stock are outstanding.
Under our amended and restated certificate of incorporation, our board of directors is authorized to issue shares of preferred stock in one or more series, and to establish from time to time a series
of preferred stock with the following terms specified: </FONT></P>

<UL>
<DL compact>
<DT style='margin-bottom:-11pt;'><FONT SIZE=2>&#149;</FONT></DT><DD><FONT SIZE=2>the
number of shares to be included in the series;
<BR><BR></FONT></DD><DT style='margin-bottom:-11pt;'><FONT SIZE=2>&#149;</FONT></DT><DD><FONT SIZE=2>the
designation, powers, preferences and rights of the shares of the series; and
<BR><BR></FONT></DD><DT style='margin-bottom:-11pt;'><FONT SIZE=2>&#149;</FONT></DT><DD><FONT SIZE=2>the
qualifications, limitations or restrictions of such series. </FONT></DD></DL>
</UL>

<P><FONT SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Prior
to the issuance of any series of preferred stock, our board of directors will adopt resolutions creating and designating the series as a series of preferred stock and the
resolutions will be filed in a certificate of designation as an amendment to the amended and restated certificate of incorporation. The term "board of directors" includes any duly authorized
committee. </FONT></P>

<P><FONT SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;The
rights of holders of the preferred stock offered may be adversely affected by the rights of holders of any shares of preferred stock that may be issued in the future. Our board of
directors may cause shares of preferred stock to be issued in public or private transactions for any proper corporate purpose. Examples of proper corporate purposes include issuances to obtain
additional financing in connection with acquisitions or otherwise, and issuances to our or our subsidiaries' officers, directors and employees pursuant to benefit plans or otherwise. Shares of
preferred stock we issue may have the effect of rendering more difficult or discouraging an acquisition of us deemed undesirable by our board of directors. </FONT></P>

<P><FONT SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;The
preferred stock will be, when issued, fully paid and nonassessable. Holders of preferred stock will not have any preemptive or subscription rights to acquire more of our stock. </FONT></P>

<P><FONT SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;The
transfer agent, registrar, dividend disbursing agent and redemption agent for shares of each series of preferred stock will be named in the prospectus supplement relating to such
series. </FONT></P>

<P><FONT SIZE=2><B>Rank  </B></FONT></P>

<P><FONT SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Unless otherwise specified in the prospectus supplement relating to the shares of a series of preferred stock, such shares will rank on an equal basis with each
other series of preferred stock and prior to the common stock as to dividends and distributions of assets. </FONT></P>

<P><FONT SIZE=2><B>Dividends  </B></FONT></P>

<P><FONT SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Unless stated otherwise in the prospectus supplement relating to the issuance of a series of preferred stock, holders of each series of preferred stock will be
entitled to receive cash dividends when, as and if declared by our board of directors out of funds legally available for dividends. The </FONT></P>

<P ALIGN="CENTER"><FONT SIZE=2>14</FONT></P>

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<BR>

<P><FONT SIZE=2>rates
and dates of payment of dividends will be set forth in the prospectus supplement relating to each series of preferred stock. Dividends will be payable to holders of record of preferred stock as
they appear on our books or, if applicable, the records of the depositary referred to below on the record dates fixed by the board of directors. Dividends on a series of preferred stock may be
cumulative or noncumulative. </FONT></P>

<P><FONT SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;We
may not declare, pay or set apart for payment dividends on the preferred stock unless full dividends on other series of preferred stock that rank on an equal or senior basis have been
paid or sufficient funds have been set apart for payment for </FONT></P>

<UL>
<DL compact>
<DT style='margin-bottom:-11pt;'><FONT SIZE=2>&#149;</FONT></DT><DD><FONT SIZE=2>all
prior dividend periods of other series of preferred stock that pay dividends on a cumulative basis; or
<BR><BR></FONT></DD><DT style='margin-bottom:-11pt;'><FONT SIZE=2>&#149;</FONT></DT><DD><FONT SIZE=2>the
immediately preceding dividend period of other series of preferred stock that pay dividends on a noncumulative basis. </FONT></DD></DL>
</UL>

<P><FONT SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Partial
dividends declared on shares of preferred stock and each other series of preferred stock ranking on an equal basis as to dividends will be declared pro rata. A pro rata
declaration means that the ratio of dividends declared per share to accrued dividends per share will be the same for each series of preferred stock. </FONT></P>

<P><FONT SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Similarly,
we may not declare, pay or set apart for payment non-stock dividends or make other payments on the common stock or any other of our stock ranking junior to the
preferred stock until full dividends on the preferred stock have been paid or set apart for payment for </FONT></P>

<UL>
<DL compact>
<DT style='margin-bottom:-11pt;'><FONT SIZE=2>&#149;</FONT></DT><DD><FONT SIZE=2>all
prior dividend periods if the preferred stock pays dividends on a cumulative basis; or
<BR><BR></FONT></DD><DT style='margin-bottom:-11pt;'><FONT SIZE=2>&#149;</FONT></DT><DD><FONT SIZE=2>the
immediately preceding dividend period if the preferred stock pays dividends on a noncumulative basis. </FONT></DD></DL>
</UL>

<P><FONT SIZE=2><B>Conversion and Exchange  </B></FONT></P>

<P><FONT SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;The prospectus supplement for a series of preferred stock will state the terms, if any, on which shares of that series are convertible into or exchangeable for
shares of our common stock, our preferred stock, our other securities or the debt or equity securities of one or more other entities. </FONT></P>


<P><FONT SIZE=2><B>Redemption and Sinking Fund  </B></FONT></P>

<P><FONT SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;If so specified in the applicable prospectus supplement, a series of preferred stock may be redeemable at any time, in whole or in part, at our option or the
option of the holder thereof and may be mandatorily redeemed. Any partial redemptions of preferred stock will be made in a way that the board of directors decides is equitable. </FONT></P>

<P><FONT SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Unless
we default in the payment of the redemption price, dividends will cease to accrue after the redemption date on shares of preferred stock called for redemption and all rights of
holders of such shares will terminate except for the right to receive the redemption price. </FONT></P>

<P><FONT SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;No
series of preferred stock will receive the benefit of a sinking fund except as set forth in the applicable prospectus supplement. </FONT></P>

<P><FONT SIZE=2><B>Liquidation Preference  </B></FONT></P>

<P><FONT SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Upon any voluntary or involuntary liquidation, dissolution or winding up, holders of each series of preferred stock will be entitled to receive distributions upon
liquidation in the amount set forth in the prospectus supplement relating to such series of preferred stock, plus an amount equal to any accrued and unpaid dividends. Such distributions will be made
before any distribution is made on any securities ranking junior relating to liquidation, including common stock. </FONT></P>

<P ALIGN="CENTER"><FONT SIZE=2>15</FONT></P>

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<P><FONT SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;If
the liquidation amounts payable relating to the preferred stock of any series and any other securities ranking on a parity regarding liquidation rights are not paid in full, the
holders of the preferred stock of such series and such other securities will share in any such distribution of our available assets on a ratable basis in proportion to the full liquidation
preferences. Holders of such series of preferred stock will not be entitled to any other amounts from us after they have received their full liquidation preference. </FONT></P>

<P><FONT SIZE=2><B>Voting Rights  </B></FONT></P>

<P><FONT SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Unless otherwise stated in the applicable prospectus supplement, the holders of shares of preferred stock will have the same voting rights as the holders of
shares of common stock. Each holder of a share of preferred stock will be entitled to one vote for each share of common stock such holder would receive upon conversion of such share of preferred stock
into common stock. </FONT></P>

<P ALIGN="CENTER"><FONT SIZE=2>16</FONT></P>

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<P ALIGN="CENTER"><FONT SIZE=2><A
NAME="di1129_description_of_warrants"> </A>
<A NAME="toc_di1129_1"> </A>
<BR></FONT><FONT SIZE=2><B>DESCRIPTION OF WARRANTS    <BR>    </B></FONT></P>

<P><FONT SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;We may issue warrants for the purchase of debt securities, common stock or preferred stock. We may issue warrants independently or together with any other
securities offered by any prospectus supplement and may be attached to or separate from the other offered securities. Each series of warrants will be issued under a separate warrant agreement to be
entered into by us with a warrant agent The warrant agent will act solely as our agent in connection with the series of warrants and will not assume any obligation or relationship of agency or trust
for or with any holders or beneficial owners of the warrants. Further terms of the warrants and the applicable warrant agreements will be set forth in the applicable prospectus supplement. As of the
date of this prospectus we have no warrants outstanding. </FONT></P>

<P><FONT SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;The
applicable prospectus supplement will describe the terms of the warrants in respect of which this prospectus is being delivered, including, where applicable, the following: </FONT></P>

<UL>
<DL compact>
<DT style='margin-bottom:-11pt;'><FONT SIZE=2>&#149;</FONT></DT><DD><FONT SIZE=2>the
title of the warrants;
<BR><BR></FONT></DD><DT style='margin-bottom:-11pt;'><FONT SIZE=2>&#149;</FONT></DT><DD><FONT SIZE=2>the
aggregate number of the warrants;
<BR><BR></FONT></DD><DT style='margin-bottom:-11pt;'><FONT SIZE=2>&#149;</FONT></DT><DD><FONT SIZE=2>the
price or prices at which the warrants will be issued;
<BR><BR></FONT></DD><DT style='margin-bottom:-11pt;'><FONT SIZE=2>&#149;</FONT></DT><DD><FONT SIZE=2>the
designation, terms and number of shares of debt securities, common stock or preferred stock purchasable upon exercise of the warrants;
<BR><BR></FONT></DD><DT style='margin-bottom:-11pt;'><FONT SIZE=2>&#149;</FONT></DT><DD><FONT SIZE=2>the
designation and terms of the offered securities, if any, with which the warrants are issued and the number of the warrants issued with each offered security;
<BR><BR></FONT></DD><DT style='margin-bottom:-11pt;'><FONT SIZE=2>&#149;</FONT></DT><DD><FONT SIZE=2>the
date, if any, on and after which the warrants and the related debt securities, common stock or preferred stock will be separately transferable;
<BR><BR></FONT></DD><DT style='margin-bottom:-11pt;'><FONT SIZE=2>&#149;</FONT></DT><DD><FONT SIZE=2>the
price at which each share of debt securities, common stock or preferred stock purchasable upon exercise of the warrants may be purchased;
<BR><BR></FONT></DD><DT style='margin-bottom:-11pt;'><FONT SIZE=2>&#149;</FONT></DT><DD><FONT SIZE=2>the
date on which the right to exercise the warrants shall commence and the date on which that right shall expire;
<BR><BR></FONT></DD><DT style='margin-bottom:-11pt;'><FONT SIZE=2>&#149;</FONT></DT><DD><FONT SIZE=2>the
minimum or maximum amount of the warrants which may be exercised at any one time;
<BR><BR></FONT></DD><DT style='margin-bottom:-11pt;'><FONT SIZE=2>&#149;</FONT></DT><DD><FONT SIZE=2>information
with respect to book-entry procedures, if any;
<BR><BR></FONT></DD><DT style='margin-bottom:-11pt;'><FONT SIZE=2>&#149;</FONT></DT><DD><FONT SIZE=2>a
discussion of certain Federal income tax considerations; and
<BR><BR></FONT></DD><DT style='margin-bottom:-11pt;'><FONT SIZE=2>&#149;</FONT></DT><DD><FONT SIZE=2>any
other terms of the warrants, including terms, procedures and limitations relating to the exchange and exercise of the warrants. </FONT></DD></DL>
</UL>
<P ALIGN="CENTER"><FONT SIZE=2><A
NAME="di1129_certain_provisions_of_delaware__cer02987"> </A>
<A NAME="toc_di1129_2"> </A>
<BR></FONT><FONT SIZE=2><B>CERTAIN PROVISIONS OF DELAWARE LAW AND OF THE COMPANY'S<BR>  CHARTER AND BYLAWS    <BR>    </B></FONT></P>

<P><FONT SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</FONT><FONT SIZE=2><I>The following paragraphs summarize certain provisions of the Delaware General Corporation Law, or DGCL, and our amended and restated
certificate of incorporation and amended and restated bylaws. The summary does not purport to be complete and is subject to and qualified in its entirety by reference to the DGCL and to our amended
and restated certificate of incorporation and amended and restated bylaws,
copies of which are on file with the Commission as exhibits to registration statements previously filed by us. See "Where You Can Find More Information."</I></FONT></P>

<P><FONT SIZE=2><B><I>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;General.</I></B></FONT><FONT SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;Certain provisions of our certificate of incorporation and by-laws and Delaware
law could make our acquisition by a third party, a change in our incumbent management, or a similar change of control more difficult, including: </FONT></P>

<P ALIGN="CENTER"><FONT SIZE=2>17</FONT></P>

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<BR>
<UL>
<DL compact>
<DT style='margin-bottom:-11pt;'><FONT SIZE=2>&#149;</FONT></DT><DD><FONT SIZE=2>an
acquisition of us by means of a tender or exchange offer;
<BR><BR></FONT></DD><DT style='margin-bottom:-11pt;'><FONT SIZE=2>&#149;</FONT></DT><DD><FONT SIZE=2>an
acquisition of us by means of a proxy contest or otherwise; or
<BR><BR></FONT></DD><DT style='margin-bottom:-11pt;'><FONT SIZE=2>&#149;</FONT></DT><DD><FONT SIZE=2>the
removal of a majority or all of our incumbent officers and directors. </FONT></DD></DL>
</UL>

<P><FONT SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;These
provisions, which are summarized below, are likely to discourage certain types of coercive takeover practices and inadequate takeover bids. These provisions are also designed to
encourage persons seeking to acquire control of us to first negotiate with our board of directors. We believe that these provisions help to protect our potential ability to negotiate with the
proponent of an unfriendly or unsolicited proposal to acquire or restructure us, and that this benefit outweighs the potential disadvantages of discouraging such a proposal because our ability to
negotiate with the proponent could result in an improvement of the terms of the proposal. </FONT></P>

<P><FONT SIZE=2><B><I>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Election and removal of directors.</I></B></FONT><FONT SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;Our certificate of incorporation and by-laws contain
provisions that effectively restrict the ability of our stockholders to remove directors without at least a majority of the voting power of the then outstanding shares. In addition, our
by-laws provide that, except as otherwise provided by law or our certificate of incorporation, newly created directorships resulting from an increase in the authorized number of directors
or vacancies on the board may be filled only by a majority of the directors then in office (even though less than a quorum is then in office) or by the sole remaining director. </FONT></P>

<P><FONT SIZE=2><B><I>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Stockholder meetings.</I></B></FONT><FONT SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;Under our certificate of incorporation and by-laws, the president,
a majority of the board of directors or a majority of the voting power of the then outstanding shares may call special meetings of stockholders. </FONT></P>


<P><FONT SIZE=2><B><I>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Delaware anti-takeover law.</I></B></FONT><FONT SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;We are subject to Section&nbsp;203 of the Delaware general
corporation law, an anti-takeover law. In general, Section&nbsp;203 prohibits a publicly held Delaware corporation from engaging in a "business combination" with an "interested
stockholder" for a period of three years following the date the person became an interested stockholder, unless the "business combination" or the transaction in which the person became an interested
stockholder is approved in a prescribed manner. Generally, a "business combination" includes a merger, asset or stock sale, or other transaction resulting in a financial benefit to the interested
stockholder. An "interested stockholder" is defined generally as a person who, together with affiliates and associates, owns or within three years prior to the determination of interested stockholder
status, did own, 15% or more of a corporation's voting stock. The existence of this provision may have an anti-takeover effect with respect to transactions not approved in advance by the
board of directors, including discouraging attempts that might result in a premium over the market price for the shares of common stock held by stockholders. </FONT></P>

<P><FONT SIZE=2><B><I>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;No cumulative voting.</I></B></FONT><FONT SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;Our certificate of incorporation and by-laws do not provide for
cumulative voting in the election of directors. </FONT></P>

<P><FONT SIZE=2><B><I>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Undesignated preferred stock.</I></B></FONT><FONT SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;The authorization of undesignated preferred stock makes it possible for
our board of directors to issue stock with voting or other rights or preferences that could impede the success of any attempt to change control of us. </FONT></P>

<P><FONT SIZE=2><B><I>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Limitation of liability.</I></B></FONT><FONT SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;As permitted by the Delaware general corporation law, our certificate of
incorporation provides that our directors will not be personally liable to us or our stockholders for monetary damages for breach of fiduciary duty as a director, except for liability: </FONT></P>

<UL>
<DL compact>
<DT style='margin-bottom:-11pt;'><FONT SIZE=2>&#149;</FONT></DT><DD><FONT SIZE=2>for
any breach of the director's duty of loyalty to us or our stockholders;
<BR><BR></FONT></DD><DT style='margin-bottom:-11pt;'><FONT SIZE=2>&#149;</FONT></DT><DD><FONT SIZE=2>for
acts or omissions not in good faith or that involve intentional misconduct or a knowing violation of law; </FONT></DD></DL>
</UL>
<P ALIGN="CENTER"><FONT SIZE=2>18</FONT></P>

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<UL>
<UL>
</UL>
<DL compact>
<DT style='margin-bottom:-11pt;'><FONT SIZE=2>&#149;</FONT></DT><DD><FONT SIZE=2>under
Section&nbsp;174 of the Delaware general corporation law, relating to unlawful payment of dividends or unlawful stock purchase or redemption of stock; or
<BR><BR></FONT></DD><DT style='margin-bottom:-11pt;'><FONT SIZE=2>&#149;</FONT></DT><DD><FONT SIZE=2>for
any transaction from which the director derives an improper personal benefit. </FONT></DD></DL>
</UL>

<P><FONT SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;As
a result of this provision, we and our stockholders may be unable to obtain monetary damages from a director for breach of his or her duty of care. </FONT></P>

<P><FONT SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Our
certificate of incorporation and by-laws also provide for the indemnification of our directors and officers to the fullest extent authorized by the Delaware general
corporation law. The indemnification provided under our certificate of incorporation and by-laws includes the right to be paid expenses in advance of any proceeding for which
indemnification may be payable, provided that the payment of these expenses incurred by a director or officer in advance of the final disposition of a proceeding may be made only upon delivery to us
of an undertaking by or on behalf of the director or officer to repay all amounts so paid in advance if it is ultimately determined that the director or officer is not entitled to be indemnified.
Insofar as indemnification for liabilities under the Securities Act may be permitted to directors, officers or controlling persons of our company pursuant to our company's Amended Charter, Amended
Bylaws and the DGCL, we have been informed that in the opinion of the Commission such indemnification is against public policy as expressed in the Securities Act and is therefore unenforceable. </FONT></P>


<P><FONT SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Under
our by-laws, we have the power to purchase and maintain insurance on behalf of any person who is or was one of our directors, officers, employees or agents, or is or
was serving at our request as a director, officer, employee or agent of another corporation, partnership, joint venture, trust or other business against any liability asserted against the person or
incurred by the person in any of these capacities, or arising out of the person's fulfilling one of these capacities, and related expenses, whether or not we would have the power to indemnify the
person against the claim under the provisions of the Delaware general corporation law. We maintain director and officer liability insurance on behalf of our directors and officers. </FONT></P>

<P ALIGN="CENTER"><FONT SIZE=2><A
NAME="di1129_legal_matters"> </A>
<A NAME="toc_di1129_3"> </A>
<BR></FONT><FONT SIZE=2><B>LEGAL MATTERS    <BR>    </B></FONT></P>

<P><FONT SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Latham&nbsp;&amp; Watkins LLP, Washington, D.C., will issue an opinion about certain legal matters with respect to the securities. </FONT></P>

<P ALIGN="CENTER"><FONT SIZE=2><A
NAME="di1129_experts"> </A>
<A NAME="toc_di1129_4"> </A>
<BR></FONT><FONT SIZE=2><B>EXPERTS    <BR>    </B></FONT></P>

<P><FONT SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;The consolidated financial statements of Cogent Communications Group,&nbsp;Inc. appearing in Cogent Communications Group,&nbsp;Inc.'s Annual Report
(Form&nbsp;10-K) for the year ended December&nbsp;31, 2005 (including the schedule appearing therein), and Cogent Communications Group,&nbsp;Inc. management's assessment of the
effectiveness of internal control over financial reporting as of December&nbsp;31, 2005 included therein, have been audited by Ernst&nbsp;&amp; Young&nbsp;LLP, independent registered public
accounting firm, as set forth in their reports thereon, included therein, and incorporated herein by reference. Such consolidated financial statements and management's assessment are incorporated
herein by reference in reliance upon such reports given on the authority of such firm as experts in accounting and auditing. </FONT></P>

<P ALIGN="CENTER"><FONT SIZE=2>19</FONT></P>

<HR NOSHADE>
<P style='page-break-before:always'></p>
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<A NAME="page_di1129_1_20"> </A>
<P ALIGN="CENTER"><FONT SIZE=2><A
NAME="di1129_where_you_can_find_more_information"> </A>
<A NAME="toc_di1129_5"> </A>
<BR></FONT><FONT SIZE=2><B>WHERE YOU CAN FIND MORE INFORMATION    <BR>    </B></FONT></P>

<P><FONT SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;We file annual, quarterly and special reports, proxy statements and other information with the Commission. You may read and copy any document we file at the
Commission's public reference room located at 100 F Street, N.E., Washington, D.C. 20549. Please call the Commission at 1-800-SEC-0330 for further information on
the public reference room. Our filings with the Commission are also available to the public at the Commission's website at http://www.sec.gov. You may also inspect copies of these materials and other
information about us at the offices of the Nasdaq Stock Market,&nbsp;Inc., National Market System, 1735 K Street, N.W., Washington, D.C. 20006-1500. </FONT></P>

<P><FONT SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;The
Commission allows us to "incorporate by reference" the information we file with them which means that we can disclose important information to you by referring you to those documents
instead of having to repeat the information in this prospectus. The information incorporated by reference is considered to be part of this prospectus, and later information that we file with the
Commission will automatically update and supersede this information. We incorporate by reference the documents listed below and any future filings made with the Commission under Sections 13(a), 13(c),
14, or 15(d) of the Securities Exchange Act of 1934, as amended, or the Exchange Act, between the date of this prospectus and the termination of the offering and also between the date of the initial
registration statement and prior to effectiveness of the registration statement: </FONT></P>

<UL>
<DL compact>
<DT style='margin-bottom:-11pt;'><FONT SIZE=2>&#149;</FONT></DT><DD><FONT SIZE=2>our
annual report on Form&nbsp;10-K for the fiscal year ended December&nbsp;31, 2005, filed on March&nbsp;16, 2006.

<BR><BR></FONT></DD>

<DT style='margin-bottom:-11pt;'><FONT SIZE=2>&#149;</FONT></DT><DD><FONT SIZE=2>our
proxy statement relating to the annual meeting of stockholders to be held on June&nbsp;7, 2006 filed on April&nbsp;28, 2006.

 </FONT></DD>

</DL>
</UL>

<P><FONT SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;This
prospectus is part of a registration statement on Form&nbsp;S-3 we have filed with the Commission under the Securities Act. This prospectus does not contain all of the
information in the registration statement. We have omitted certain parts of the registration statement, as permitted by the rules and regulations of the Commission. You may inspect and copy the
registration statement, including exhibits, at the Commission's public reference room or website. Our statements in this prospectus about the contents of any contract or other document are not
necessarily complete. You should refer to the copy of each contract or other document we have filed as an exhibit to the registration statement for complete information. </FONT></P>

<P><FONT SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;We
will furnish without charge to you, upon written or oral request, a copy of any or all of the documents incorporated by reference, including exhibits to these documents. You should
direct any requests for documents to Cogent Communications Group,&nbsp;Inc., 1015 31<SUP>st</SUP> Street N.W., Washington, D.C. 20007, telephone: (202)&nbsp;295-4200. </FONT></P>

<P ALIGN="CENTER"><FONT SIZE=2>20</FONT></P>

<HR NOSHADE>
<P style='page-break-before:always'></p>
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<!-- THIS IS THE END OF A COMPOSITION COMPONENT -->

<P><FONT SIZE=2>
<hr noshade width=100% align=left size=4>
<hr noshade width=100% align=left size=1> </FONT></P>

<P ALIGN="CENTER"><FONT SIZE=2><B>
<IMG SRC="g444640.jpg" ALT="GRAPHIC" WIDTH="243" HEIGHT="91">
  </B></FONT></P>

<P ALIGN="CENTER"><FONT SIZE=4><B>$75,000,000  </B></FONT></P>

<P ALIGN="CENTER"><FONT SIZE=4><B> Debt Securities, Common Stock,<BR>
Preferred Stock and Warrants  </B></FONT></P>

<HR NOSHADE ALIGN="CENTER" WIDTH="120">
<P ALIGN="CENTER"><FONT SIZE=4><B> 16,000,000 Shares<BR>
Common Stock  </B></FONT></P>

<P ALIGN="CENTER"><FONT SIZE=4><B>PROSPECTUS  </B></FONT></P>

<P ALIGN="CENTER"><FONT SIZE=4><B> &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;, 2006  </B></FONT></P>

<P><FONT SIZE=4><B> <hr noshade width=100% align=left size=1>
<hr noshade width=100% align=left size=4>  </B></FONT></P>

<P><FONT SIZE=2><B>You should rely only on the information contained or incorporated by reference in this prospectus. We have not authorized anyone to
provide you with different information. You should not assume that the information contained or incorporated by reference in this prospectus is accurate as of any date other than the date of this
prospectus. We are not making an offer of these securities in any state where the offer is not permitted.</B></FONT></P>

<HR NOSHADE>
<P style='page-break-before:always'></p>
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<BR>
<!-- THIS IS THE END OF A COMPOSITION COMPONENT -->
<P ALIGN="CENTER"><FONT SIZE=2><A
NAME="page_ja1129_1_1"> </A> </FONT></P>

<!-- TOC_END -->
<P ALIGN="CENTER"><FONT SIZE=2><A
NAME="ja1129_part_ii_information_not_required_in_the_prospectus"> </A>
<A NAME="toc_ja1129_1"> </A>
<BR></FONT><FONT SIZE=2><B>PART II    <BR>    <BR>    INFORMATION NOT REQUIRED IN THE PROSPECTUS    <BR>    </B></FONT></P>

<P><FONT SIZE=2><A
NAME="ja1129_item_14._other_expenses_of_issuance_and_distribution."> </A>
<A NAME="toc_ja1129_2"> </A></FONT> <FONT SIZE=2><B>Item 14. Other Expenses of Issuance and Distribution.    <BR>    </B></FONT></P>


<P><FONT SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;The expenses to be paid by us in connection with the distribution of the securities being registered are as set forth in the following table. All amounts shown
are estimates except for the Securities and Exchange Commission registration fee. </FONT></P>

<!-- User-specified TAGGED TABLE -->
<DIV ALIGN="CENTER"><TABLE WIDTH="64%" BORDER=0 CELLSPACING=0 CELLPADDING=0>
<TR BGCOLOR="#CCEEFF" VALIGN="BOTTOM">
<TD COLSPAN=2><FONT SIZE=2>Securities and Exchange Commission Registration Fee</FONT></TD>
<TD WIDTH="3%"><FONT SIZE=2>&nbsp;</FONT></TD>
<TD WIDTH="3%"><FONT SIZE=2>$</FONT></TD>
<TD WIDTH="13%" ALIGN="RIGHT"><FONT SIZE=2>25,385</FONT></TD>
</TR>
<TR BGCOLOR="White" VALIGN="BOTTOM">
<TD COLSPAN=2><FONT SIZE=2>Legal Fees and Expenses</FONT></TD>
<TD WIDTH="3%"><FONT SIZE=2>&nbsp;</FONT></TD>
<TD WIDTH="3%"><FONT SIZE=2>&nbsp;</FONT></TD>
<TD WIDTH="13%" ALIGN="RIGHT"><FONT SIZE=2>200,000</FONT></TD>
</TR>
<TR BGCOLOR="#CCEEFF" VALIGN="BOTTOM">
<TD COLSPAN=2><FONT SIZE=2>Accounting Fees and Expenses</FONT></TD>
<TD WIDTH="3%"><FONT SIZE=2>&nbsp;</FONT></TD>
<TD WIDTH="3%"><FONT SIZE=2>&nbsp;</FONT></TD>
<TD WIDTH="13%" ALIGN="RIGHT"><FONT SIZE=2>75,000</FONT></TD>
</TR>
<TR BGCOLOR="White" VALIGN="BOTTOM">
<TD COLSPAN=2><FONT SIZE=2>Printing Expenses</FONT></TD>
<TD WIDTH="3%"><FONT SIZE=2>&nbsp;</FONT></TD>
<TD WIDTH="3%"><FONT SIZE=2>&nbsp;</FONT></TD>
<TD WIDTH="13%" ALIGN="RIGHT"><FONT SIZE=2>50,000</FONT></TD>
</TR>
<TR BGCOLOR="#CCEEFF" VALIGN="BOTTOM">
<TD COLSPAN=2><FONT SIZE=2>Blue Sky Fees</FONT></TD>
<TD WIDTH="3%"><FONT SIZE=2>&nbsp;</FONT></TD>
<TD WIDTH="3%"><FONT SIZE=2>&nbsp;</FONT></TD>
<TD WIDTH="13%" ALIGN="RIGHT"><FONT SIZE=2>5,000</FONT></TD>
</TR>
<TR BGCOLOR="White" VALIGN="BOTTOM">
<TD COLSPAN=2><FONT SIZE=2>Transfer Agent Fees and Expenses</FONT></TD>
<TD WIDTH="3%"><FONT SIZE=2>&nbsp;</FONT></TD>
<TD WIDTH="3%"><FONT SIZE=2>&nbsp;</FONT></TD>
<TD WIDTH="13%" ALIGN="RIGHT"><FONT SIZE=2>50,000</FONT></TD>
</TR>
<TR BGCOLOR="#CCEEFF" VALIGN="BOTTOM">
<TD COLSPAN=2><FONT SIZE=2>Trustee Fees and Expenses</FONT></TD>
<TD WIDTH="3%"><FONT SIZE=2>&nbsp;</FONT></TD>
<TD WIDTH="3%"><FONT SIZE=2>&nbsp;</FONT></TD>
<TD WIDTH="13%" ALIGN="RIGHT"><FONT SIZE=2>25,000</FONT></TD>
</TR>
<TR BGCOLOR="White" VALIGN="BOTTOM">
<TD COLSPAN=2><FONT SIZE=2>Miscellaneous</FONT></TD>
<TD WIDTH="3%"><FONT SIZE=2>&nbsp;</FONT></TD>
<TD WIDTH="3%"><FONT SIZE=2>&nbsp;</FONT></TD>
<TD WIDTH="13%" ALIGN="RIGHT"><FONT SIZE=2>19,615</FONT></TD>
</TR>
<TR VALIGN="TOP">
<TD COLSPAN=2><FONT SIZE=2>&nbsp;</FONT></TD>
<TD WIDTH="3%"><FONT SIZE=2>&nbsp;</FONT></TD>
<TD COLSPAN=2 ALIGN="RIGHT"><HR NOSHADE></TD>
</TR>
<TR BGCOLOR="#CCEEFF" VALIGN="BOTTOM">
<TD WIDTH="3%"><FONT SIZE=0>&nbsp;</FONT></TD>
<TD WIDTH="78%"><FONT SIZE=2>Total</FONT></TD>
<TD WIDTH="3%"><FONT SIZE=2>&nbsp;</FONT></TD>
<TD WIDTH="3%"><FONT SIZE=2>$</FONT></TD>
<TD WIDTH="13%" ALIGN="RIGHT"><FONT SIZE=2>450,000</FONT></TD>
</TR>
<TR VALIGN="TOP">
<TD COLSPAN=2><FONT SIZE=2>&nbsp;</FONT></TD>
<TD WIDTH="3%"><FONT SIZE=2>&nbsp;</FONT></TD>
<TD COLSPAN=2 ALIGN="RIGHT"><HR NOSHADE SIZE=4></TD>
</TR>
</TABLE></DIV>
<!-- end of user-specified TAGGED TABLE -->


<P><FONT SIZE=2><A
NAME="ja1129_item_15._indemnification_of_directors_and_officers."> </A>
<A NAME="toc_ja1129_3"> </A>
<BR></FONT><FONT SIZE=2><B>Item 15. Indemnification of Directors and Officers.    <BR>    </B></FONT></P>

<P><FONT SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Section&nbsp;145 of the Delaware General Corporation Law, or the DGCL, allows for the indemnification of officers, directors, and other corporate agents in
terms sufficiently broad to indemnify these persons for liabilities (including reimbursement for expenses incurred) arising under the Securities Act of 1933, as amended. The Registrant's Amended and
Restated Certificate of Incorporation and Amended and Restated Bylaws provide for indemnification of the Registrant's directors, officers, employees and other agents to the extent and under the
circumstances permitted by the DGCL. In addition, the Registrant carries director and officer liability insurance. </FONT></P>

<P ALIGN="CENTER"><FONT SIZE=2>II-1</FONT></P>

<HR NOSHADE>
<P style='page-break-before:always'></p>

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<A NAME="page_ja1129_1_2"> </A>
<BR>

<P><FONT SIZE=2><A
NAME="ja1129_item_16._exhibits"> </A>
<A NAME="toc_ja1129_4"> </A>
<BR></FONT><FONT SIZE=2><B>Item 16. Exhibits    <BR>    </B></FONT></P>




<!-- User-specified TAGGED TABLE -->
<TABLE WIDTH="100%" BORDER=0 CELLSPACING=0 CELLPADDING=0>
<TR VALIGN="TOP">
<TD WIDTH="9%"><FONT SIZE=2>&nbsp;&nbsp;3.1</FONT></TD>
<TD WIDTH="3%"><FONT SIZE=2>&nbsp;</FONT></TD>
<TD WIDTH="88%"><FONT SIZE=2>Fifth Amended and Restated Certificate of Incorporation (incorporated by reference to Exhibit 3.1 of our Annual Report on Form 10-K for the year ended December 31, 2004, filed on March 31, 2005).</FONT></TD>
</TR>
<TR VALIGN="TOP">
<TD WIDTH="9%"><FONT SIZE=2><BR>
&nbsp;&nbsp;3.2</FONT></TD>
<TD WIDTH="3%"><FONT SIZE=2><BR>&nbsp;</FONT></TD>
<TD WIDTH="88%"><FONT SIZE=2><BR>
Amended Bylaws of Cogent Communications Group, Inc. (incorporated by reference to Exhibit 3.2 of our Quarterly Report on Form 10-Q for the quarter ended March 31, 2005, filed on May 6, 2005).</FONT></TD>
</TR>
<TR VALIGN="TOP">
<TD WIDTH="9%"><FONT SIZE=2><BR>
&nbsp;&nbsp;4.1(1)</FONT></TD>
<TD WIDTH="3%"><FONT SIZE=2><BR>&nbsp;</FONT></TD>
<TD WIDTH="88%"><FONT SIZE=2><BR>
Specimen Preferred Stock Certificate.</FONT></TD>
</TR>
<TR VALIGN="TOP">
<TD WIDTH="9%"><FONT SIZE=2><BR>
&nbsp;&nbsp;4.2(1)</FONT></TD>
<TD WIDTH="3%"><FONT SIZE=2><BR>&nbsp;</FONT></TD>
<TD WIDTH="88%"><FONT SIZE=2><BR>
Form of Debt Security.</FONT></TD>
</TR>
<TR VALIGN="TOP">
<TD WIDTH="9%"><FONT SIZE=2><BR>
&nbsp;&nbsp;4.3</FONT></TD>
<TD WIDTH="3%"><FONT SIZE=2><BR>*</FONT></TD>
<TD WIDTH="88%"><FONT SIZE=2><BR>
Form of Indenture, between Cogent Communications Group, Inc. and one or more trustees to be named.</FONT></TD>
</TR>
<TR VALIGN="TOP">
<TD WIDTH="9%"><FONT SIZE=2><BR>
&nbsp;&nbsp;4.4(1)</FONT></TD>
<TD WIDTH="3%"><FONT SIZE=2><BR>&nbsp;</FONT></TD>
<TD WIDTH="88%"><FONT SIZE=2><BR>
Form of Warrant.</FONT></TD>
</TR>
<TR VALIGN="TOP">
<TD WIDTH="9%"><FONT SIZE=2><BR>
&nbsp;&nbsp;5.1</FONT></TD>
<TD WIDTH="3%"><FONT SIZE=2><BR>*</FONT></TD>
<TD WIDTH="88%"><FONT SIZE=2><BR>
Form of Opinion of Latham &amp; Watkins LLP.</FONT></TD>
</TR>
<TR VALIGN="TOP">
<TD WIDTH="9%"><FONT SIZE=2><BR>
12.1</FONT></TD>
<TD WIDTH="3%"><FONT SIZE=2><BR>*</FONT></TD>
<TD WIDTH="88%"><FONT SIZE=2><BR>
Statement of Computation of Ratios.</FONT></TD>
</TR>
<TR VALIGN="TOP">
<TD WIDTH="9%"><FONT SIZE=2><BR>
23.1</FONT></TD>
<TD WIDTH="3%"><FONT SIZE=2><BR>&nbsp;</FONT></TD>
<TD WIDTH="88%"><FONT SIZE=2><BR>
Consent of Ernst &amp; Young LLP, independent registered public accounting firm.</FONT></TD>
</TR>
<TR VALIGN="TOP">
<TD WIDTH="9%"><FONT SIZE=2><BR>
23.2</FONT></TD>
<TD WIDTH="3%"><FONT SIZE=2><BR>&nbsp;</FONT></TD>
<TD WIDTH="88%"><FONT SIZE=2><BR>
Consent of Latham &amp; Watkins LLP (included in Exhibit 5.1).</FONT></TD>
</TR>
<TR VALIGN="TOP">
<TD WIDTH="9%"><FONT SIZE=2><BR>
24.1</FONT></TD>
<TD WIDTH="3%"><FONT SIZE=2><BR>*</FONT></TD>
<TD WIDTH="88%"><FONT SIZE=2><BR>
Power of Attorney.</FONT></TD>
</TR>
<TR VALIGN="TOP">
<TD WIDTH="9%"><FONT SIZE=2><BR>
25.1(1)</FONT></TD>
<TD WIDTH="3%"><FONT SIZE=2><BR>&nbsp;</FONT></TD>
<TD WIDTH="88%"><FONT SIZE=2><BR>
Statement of Eligibility of Trustee on Form T-1.</FONT></TD>
</TR>
</TABLE>

<!-- end of user-specified TAGGED TABLE -->

<HR NOSHADE ALIGN="LEFT" WIDTH="120">

<DL compact>

<DT style='margin-bottom:-11pt;'><FONT SIZE=2>*</FONT></DT><DD><FONT SIZE=2>Previously
filed.

<BR><BR></FONT></DD>

<DT style='margin-bottom:-11pt;'><FONT SIZE=2>(1)</FONT></DT><DD><FONT SIZE=2>To
be filed by amendment or by a report filed under the Securities Exchange Act of 1934, as amended, and incorporated herein by reference. </FONT></DD></DL>

<P><FONT SIZE=2><A
NAME="ja1129_item_17._undertakings"> </A>
<A NAME="toc_ja1129_5"> </A>
<BR></FONT><FONT SIZE=2><B>Item 17. Undertakings    <BR>    </B></FONT></P>


<P><FONT SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;The undersigned registrant hereby undertakes: </FONT></P>

<UL>
<DL compact>
<DT style='margin-bottom:-11pt;'><FONT SIZE=2>(1)</FONT></DT><DD><FONT SIZE=2>To
file, during any period in which offers or sales are being made, a post-effective amendment to this registration statement:
<BR><BR></FONT>
<DL compact>
<DT style='margin-bottom:-11pt;'><FONT SIZE=2>(i)</FONT></DT><DD><FONT SIZE=2>To
include any propectus required by section&nbsp;10(a)(3) of the Securities Act of 1933;
<BR><BR></FONT></DD><DT style='margin-bottom:-11pt;'><FONT SIZE=2>(ii)</FONT></DT><DD><FONT SIZE=2>To
reflect in the prospectus any facts or events arising after the effective date of the registration statement (or the most recent post-effective amendment
thereof) which, individually or in the aggregate, represent a fundamental change in the information set forth in the registration statement. Notwithstanding the foregoing, any increase or decrease in
volume of securities offered (if the total dollar value of securities offered would not exceed that which was registered) and any deviation from the low or high end of the estimated maximum offering
range may be reflected in the form of prospectus filed with the Commission pursuant to Rule&nbsp;424(b) if, in the aggregate, the changes in volume and price represent no more than 20% change in the
maximum aggregate offering price set forth in the "Calculation of Registration Fee" table in the effective registration statement. </FONT></DD></DL>
</DD></DL>
</UL>
<P ALIGN="CENTER"><FONT SIZE=2>II-2</FONT></P>

<HR NOSHADE>
<P style='page-break-before:always'></p>
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<A NAME="page_ja1129_1_3"> </A>
<UL>
<UL>
<DL compact>
<DT style='margin-bottom:-11pt;'><FONT SIZE=2>(iii)</FONT></DT><DD><FONT SIZE=2>To
include any material information with respect to the plan of distribution not previously disclosed in the registration statement or any material change to such
information in the registration statement;
<BR><BR></FONT></DD><DT style='margin-bottom:-11pt;'><BR></DT><DD><FONT SIZE=2><I>Provided, however, </I></FONT><FONT SIZE=2>That paragraphs (a)(1)(i), (a)(1)(ii)&nbsp;and (a)(1)(iii)&nbsp;of this
section do not apply if the information required to be included in a post-effective amendment by those paragraphs is contained in reports filed with or furnished to the Commission by the
registrant pursuant to section&nbsp;13 or section&nbsp;15(d) of the Securities Exchange Act of 1934 that are incorporated by reference in the registration statement, or is contained in a form of
prospectus filed pursuant to Rule&nbsp;424(b) that is part of the registration statement.
<BR><BR></FONT></DD></DL>
</UL>
<DL compact>
<DT style='margin-bottom:-11pt;'><FONT SIZE=2>(2)</FONT></DT><DD><FONT SIZE=2>That,
for the purpose of determining any liability under the Securities Act of 1933, each such post-effective amendment shall be deemed to be a new registration statement
relating to the securities offered therein, and the offering of such securities at that time shall be deemed to be the initial bona fide offering thereof.
<BR><BR></FONT></DD><DT style='margin-bottom:-11pt;'><FONT SIZE=2>(3)</FONT></DT><DD><FONT SIZE=2>To
remove from registration by means of a post-effective amendment any of the securities being registered which remain unsold at the termination of the offering.
<BR><BR></FONT></DD><DT style='margin-bottom:-11pt;'><FONT SIZE=2>(4)</FONT></DT><DD><FONT SIZE=2>That,
for the purpose of determining liability under the Securities Act of 1933 to any purchaser:
<BR><BR></FONT>
<DL compact>
<DT style='margin-bottom:-11pt;'><FONT SIZE=2>(i)</FONT></DT><DD><FONT SIZE=2>Each
prospectus filed by the registrant pursuant to Rule&nbsp;424(b)(3)shall be deemed to be part of the registration statement as of the date the filed prospectus was
deemed part of and included in the registration statement; and
<BR><BR></FONT></DD><DT style='margin-bottom:-11pt;'><FONT SIZE=2>(ii)</FONT></DT><DD><FONT SIZE=2>Each
prospectus required to be filed pursuant to Rule&nbsp;424(b)(2), (b)(5), or (b)(7) as part of a registration statement in reliance on Rule&nbsp;430B relating
to an offering made pursuant to Rule&nbsp;415(a)(1)(i), (vii), or (x)&nbsp;for the purpose of providing the information required by section&nbsp;10(a) of the Securities Act of 1933 shall be
deemed to be part of and included in the registration statement as of the earlier of the date such form of prospectus is first used after effectiveness or the date of the first contract of sale of
securities in the offering described in the prospectus. As provided in Rule&nbsp;430B, for liability purposes of the issuer and any person that is at that date an underwriter, such date shall be
deemed to be a new effective date of the registration statement relating to the securities in the registration statement to which that prospectus relates, and the offering of such securities at that
time shall be deemed to be the initial bona fide offering thereof. Provided, however, that no statement made in a registration statement or prospectus that is part of the registration statement or
made in a document incorporated or deemed incorporated by reference into the registration statement or prospectus that is part of the registration statement will, as to a purchaser with a time of
contract of sale prior to such effective date, supersede or modify any statement that was made in the registration statement or prospectus that was part of the registration statement or made in any
such document immediately prior to such effective date; or
<BR><BR></FONT></DD></DL>
</DD><DT style='margin-bottom:-11pt;'><FONT SIZE=2>(5)</FONT></DT><DD><FONT SIZE=2>That,
for the purpose of determining liability of the registrant under the Securities Act of 1933 to any purchaser in the initial distribution of the securities: The undersigned
registrant undertakes that in a primary offering of securities of the undersigned registrant pursuant to this registration statement, regardless of the underwriting method used to sell the securities
to the purchaser, if the securities are offered or sold to such purchaser by means of any of the following communications, the undersigned registrant will be a seller to the purchaser and will be
considered to offer or sell such securities to such purchaser:
<BR><BR></FONT>
<DL compact>
<DT style='margin-bottom:-11pt;'><FONT SIZE=2>(i)</FONT></DT><DD><FONT SIZE=2>Any
preliminary prospectus or prospectus of the undersigned registrant relating to the offering required to be filed pursuant to Rule&nbsp;424; </FONT></DD></DL>
</DD></DL>
</UL>
<P ALIGN="CENTER"><FONT SIZE=2>II-3</FONT></P>

<HR NOSHADE>
<P style='page-break-before:always'></p>
<!-- ZEQ.=3,SEQ=28,EFW="2169787",CP="COGENT COMMUNICATIONS GROUP, INC",DN="1",CHK=601127,FOLIO='II-3',FILE='DISK124:[06WDC9.06WDC1129]JA1129A.;12',USER='JENGLIS',CD=';1-MAY-2006;14:23' -->
<A NAME="page_ja1129_1_4"> </A>
<UL>
<UL>
<DL compact>
<DT style='margin-bottom:-11pt;'><FONT SIZE=2>(ii)</FONT></DT><DD><FONT SIZE=2>Any
free writing prospectus relating to the offering prepared by or on behalf of the undersigned registrant or used or referred to by the undersigned registrant;
<BR><BR></FONT></DD><DT style='margin-bottom:-11pt;'><FONT SIZE=2>(iii)</FONT></DT><DD><FONT SIZE=2>The
portion of any other free writing prospectus relating to the offering containing material information about the undersigned registrant or its securities provided
by or on behalf of the undersigned registrant; and
<BR><BR></FONT></DD><DT style='margin-bottom:-11pt;'><FONT SIZE=2>(iv)</FONT></DT><DD><FONT SIZE=2>Any
other communication that is an offer in the offering made by the undersigned registrant to the purchaser.
<BR><BR></FONT></DD></DL>
</UL>
<DL compact>
<DT style='margin-bottom:-11pt;'><FONT SIZE=2>(6)</FONT></DT><DD><FONT SIZE=2>That,
for purposes of determining any liability under the Securities Act of 1933, each filing of the registrant's annual report pursuant to section&nbsp;13(a) or
section&nbsp;15(d) of the Securities Exchange Act of 1934 (and, where applicable, each filing of an employee benefit plan's annual report pursuant to section&nbsp;15(d) of the Securities Exchange
Act of 1934) that is incorporated by reference in the registration statement shall be deemed to be a new registration statement relating to the securities offered therein, and the offering of such
securities at that time shall be deemed to be the initial bona fide offering thereof.
<BR><BR></FONT></DD><DT style='margin-bottom:-11pt;'><FONT SIZE=2>(7)</FONT></DT><DD><FONT SIZE=2>The
undersigned registrant hereby undertakes to supplement the prospectus, after the expiration of the subscription period, to set forth the results of the subscription offer, the
transactions by the underwriters during the subscription period, the amount of unsubscribed securities to be purchased by the underwriters, and the terms of any subsequent reoffering thereof. If any
public offering by the underwriters is to be made on terms differing from those set forth on the cover page of the prospectus, a post-effective amendment will be filed to set forth the
terms of such offering.
<BR><BR></FONT></DD><DT style='margin-bottom:-11pt;'><FONT SIZE=2>(8)</FONT></DT><DD><FONT SIZE=2>The
undersigned registrant hereby undertakes to deliver or cause to be delivered with the prospectus, to each person to whom the prospectus is sent or given, the latest annual report
to security holders that is incorporated by reference in the prospectus and furnished pursuant to and meeting the requirements of Rule&nbsp;14a-3 or Rule&nbsp;14c-3 under
the Securities Exchange Act of 1934; and, where interim financial information required to be presented by Article&nbsp;3 of Regulation&nbsp;S-X are not set forth in the prospectus, to
deliver, or cause to be delivered to each person to whom the prospectus is sent or given, the latest quarterly report that is specifically incorporated by reference in the prospectus to provide such
interim financial information.
<BR><BR></FONT></DD><DT style='margin-bottom:-11pt;'><FONT SIZE=2>(9)</FONT></DT><DD><FONT SIZE=2>Insofar
as indemnification for liabilities arising under the Securities Act of 1933 may be permitted to directors, officers and controlling persons of the registrant pursuant to the
foregoing provisions, or otherwise, the registrant has been advised that in the opinion of the Securities and Exchange Commission such indemnification is against public policy as expressed in the Act
and is, therefore, unenforceable. In the event that a claim for indemnification against such liabilities (other than the payment by the registrant of expenses incurred or paid by a director, officer
or controlling person of the registrant in the successful defense of any action, suit or proceeding) is asserted by such director, officer or controlling person in connection with the securities being
registered, the registrant will, unless in the opinion of its counsel the matter has been settled by controlling precedent, submit to a court of appropriate jurisdiction the question whether such
indemnification by it is against public policy as expressed in the Act and will be governed by the final adjudication of such issue.
<BR><BR></FONT></DD><DT style='margin-bottom:-11pt;'><FONT SIZE=2>(10)</FONT></DT><DD><FONT SIZE=2>The
undersigned registrant hereby undertakes to file an application for the purpose of determining the eligibility of the trustee to act under subsection (a)&nbsp;of
section&nbsp;310 of the Trust Indenture Act ("Act") in accordance with the rules and regulations prescribed by the Commission under section&nbsp;305(b)2 of the Act. </FONT></DD></DL>
</UL>
<P ALIGN="CENTER"><FONT SIZE=2>II-4</FONT></P>

<HR NOSHADE>
<P style='page-break-before:always'></p>
<!-- ZEQ.=4,SEQ=29,EFW="2169787",CP="COGENT COMMUNICATIONS GROUP, INC",DN="1",CHK=799845,FOLIO='II-4',FILE='DISK124:[06WDC9.06WDC1129]JA1129A.;12',USER='JENGLIS',CD=';1-MAY-2006;14:23' -->
<UL>
<UL>
</UL>
</UL>
<!-- THIS IS THE END OF A COMPOSITION COMPONENT -->
<P ALIGN="CENTER"><FONT SIZE=2><A
NAME="page_jc1129_1_5"> </A> </FONT></P>

<!-- TOC_END -->
<P ALIGN="CENTER"><FONT SIZE=2><A
NAME="jc1129_signatures"> </A>
<A NAME="toc_jc1129_1"> </A>
<BR></FONT><FONT SIZE=2><B>SIGNATURES    <BR>    </B></FONT></P>

<P>


<FONT SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Pursuant to the requirements of the Securities Act of 1933, the Registrant certifies that it has reasonable grounds to believe that it meets all of the
requirements for filing on Form&nbsp;S-3 and has duly caused this Registration Statement to be signed on its behalf by the undersigned, thereunto duly authorized, in the District of
Columbia on April&nbsp;28, 2006.

 </FONT>

</P>

<!-- User-specified TAGGED TABLE -->
<TABLE WIDTH="100%" BORDER=0 CELLSPACING=0 CELLPADDING=0>
<TR VALIGN="TOP">
<TD WIDTH="44%"><FONT SIZE=2><BR>
&nbsp;</FONT></TD>
<TD COLSPAN=3><FONT SIZE=2><BR>
COGENT COMMUNICATIONS GROUP,&nbsp;INC.</FONT></TD>
</TR>
<TR VALIGN="TOP">
<TD WIDTH="44%"><FONT SIZE=2><BR>
&nbsp;</FONT></TD>
<TD WIDTH="4%"><FONT SIZE=2><BR>
By:</FONT></TD>
<TD COLSPAN=2><FONT SIZE=2><BR>
/s/&nbsp;&nbsp;</FONT><FONT SIZE=2>DAVID SCHAEFFER</FONT><FONT SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</FONT><HR NOSHADE></TD>
</TR>
<TR VALIGN="TOP">
<TD WIDTH="44%"><FONT SIZE=2>&nbsp;</FONT></TD>
<TD WIDTH="4%"><FONT SIZE=2>&nbsp;</FONT></TD>
<TD WIDTH="8%"><FONT SIZE=2>Name:</FONT></TD>
<TD WIDTH="44%"><FONT SIZE=2>David Schaeffer</FONT></TD>
</TR>
<TR VALIGN="TOP">
<TD WIDTH="44%"><FONT SIZE=2>&nbsp;</FONT></TD>
<TD WIDTH="4%"><FONT SIZE=2>&nbsp;</FONT></TD>
<TD WIDTH="8%"><FONT SIZE=2>Title:</FONT></TD>
<TD WIDTH="44%"><FONT SIZE=2>Chairman and Chief Executive Officer</FONT></TD>
</TR>
</TABLE>
<!-- end of user-specified TAGGED TABLE -->


<P><FONT SIZE=2>


&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Pursuant to the requirements of the Securities Act of 1933, this registration statement has been signed by the following persons in the capacities and on the dates indicated.

 </FONT></P>




<!-- User-specified TAGGED TABLE -->
<TABLE WIDTH="100%" BORDER=0 CELLSPACING=0 CELLPADDING=0>
<TR VALIGN="BOTTOM">
<TH WIDTH="37%" ALIGN="CENTER"><FONT SIZE=1><B>Signature</B></FONT><HR NOSHADE></TH>
<TH WIDTH="3%"><FONT SIZE=1>&nbsp;</FONT></TH>
<TH WIDTH="39%" ALIGN="CENTER"><FONT SIZE=1><B>Title</B></FONT><HR NOSHADE></TH>
<TH WIDTH="3%"><FONT SIZE=1>&nbsp;</FONT></TH>
<TH WIDTH="19%" ALIGN="CENTER"><FONT SIZE=1><B>Date</B></FONT><HR NOSHADE></TH>
</TR>
<TR VALIGN="BOTTOM">
<TD WIDTH="37%" ALIGN="CENTER" VALIGN="TOP"><BR><FONT SIZE=2>&nbsp;</FONT></TD>
<TD WIDTH="3%" VALIGN="TOP"><FONT SIZE=2><BR>&nbsp;</FONT></TD>
<TD WIDTH="39%" VALIGN="TOP"><FONT SIZE=2><BR>
&nbsp;</FONT></TD>
<TD WIDTH="3%" VALIGN="TOP"><FONT SIZE=2><BR>&nbsp;</FONT></TD>
<TD WIDTH="19%" VALIGN="TOP"><FONT SIZE=2><BR>
&nbsp;</FONT></TD>
</TR>
<TR VALIGN="TOP">
<TD WIDTH="37%" ALIGN="CENTER"><FONT SIZE=2>/s/&nbsp;&nbsp;</FONT><FONT SIZE=2>DAVID SCHAEFFER</FONT><FONT SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</FONT><HR NOSHADE><FONT SIZE=2> David Schaeffer</FONT></TD>
<TD WIDTH="3%"><FONT SIZE=2>&nbsp;</FONT></TD>
<TD WIDTH="39%" ALIGN="CENTER"><FONT SIZE=2>Chairman and Chief Executive Officer (Principal Executive Officer)</FONT></TD>
<TD WIDTH="3%"><FONT SIZE=2>&nbsp;</FONT></TD>
<TD WIDTH="19%" ALIGN="RIGHT"><FONT SIZE=2>April&nbsp;28,&nbsp;2006</FONT></TD>
</TR>
<TR VALIGN="TOP">
<TD WIDTH="37%" ALIGN="CENTER"><FONT SIZE=2><BR>
/s/&nbsp;&nbsp;</FONT><FONT SIZE=2>THADDEUS G. WEED</FONT><FONT SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</FONT><HR NOSHADE><FONT SIZE=2> Thaddeus G. Weed</FONT></TD>
<TD WIDTH="3%"><FONT SIZE=2><BR>&nbsp;</FONT></TD>
<TD WIDTH="39%" ALIGN="CENTER"><FONT SIZE=2><BR>
Chief Financial Officer (Principal Financial and Accounting Officer)</FONT></TD>
<TD WIDTH="3%"><FONT SIZE=2><BR>&nbsp;</FONT></TD>
<TD WIDTH="19%" ALIGN="RIGHT"><FONT SIZE=2><BR>
April&nbsp;28,&nbsp;2006</FONT></TD>
</TR>
<TR VALIGN="BOTTOM">
<TD WIDTH="37%" ALIGN="CENTER" VALIGN="TOP"><FONT SIZE=2><BR>
/s/&nbsp;&nbsp;</FONT><FONT SIZE=2>EDWARD GLASSMEYER</FONT><FONT SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</FONT><HR NOSHADE><FONT SIZE=2> Edward Glassmeyer</FONT></TD>
<TD WIDTH="3%" VALIGN="TOP"><FONT SIZE=2><BR>&nbsp;</FONT></TD>
<TD WIDTH="39%" ALIGN="CENTER" VALIGN="TOP"><FONT SIZE=2><BR>
Director</FONT></TD>
<TD WIDTH="3%" VALIGN="TOP"><FONT SIZE=2><BR>&nbsp;</FONT></TD>
<TD WIDTH="19%" ALIGN="RIGHT" VALIGN="TOP"><FONT SIZE=2><BR>
April&nbsp;28,&nbsp;2006</FONT></TD>
</TR>
<TR VALIGN="BOTTOM">
<TD WIDTH="37%" ALIGN="CENTER" VALIGN="TOP"><FONT SIZE=2><BR>
/s/&nbsp;&nbsp;</FONT><FONT SIZE=2>EREL MARGALIT</FONT><FONT SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</FONT><HR NOSHADE><FONT SIZE=2> Erel Margalit</FONT></TD>
<TD WIDTH="3%" VALIGN="TOP"><FONT SIZE=2><BR>&nbsp;</FONT></TD>
<TD WIDTH="39%" ALIGN="CENTER" VALIGN="TOP"><FONT SIZE=2><BR>
Director</FONT></TD>
<TD WIDTH="3%" VALIGN="TOP"><FONT SIZE=2><BR>&nbsp;</FONT></TD>
<TD WIDTH="19%" ALIGN="RIGHT" VALIGN="TOP"><FONT SIZE=2><BR>
April&nbsp;28,&nbsp;2006</FONT></TD>
</TR>
<TR VALIGN="BOTTOM">
<TD WIDTH="37%" ALIGN="CENTER" VALIGN="TOP"><FONT SIZE=2><BR>
/s/&nbsp;&nbsp;</FONT><FONT SIZE=2>JEAN-JACQUES BERTRAND</FONT><FONT SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</FONT><HR NOSHADE><FONT SIZE=2> Jean-Jacques Bertrand</FONT></TD>
<TD WIDTH="3%" VALIGN="TOP"><FONT SIZE=2><BR>&nbsp;</FONT></TD>
<TD WIDTH="39%" ALIGN="CENTER" VALIGN="TOP"><FONT SIZE=2><BR>
Director</FONT></TD>
<TD WIDTH="3%" VALIGN="TOP"><FONT SIZE=2><BR>&nbsp;</FONT></TD>
<TD WIDTH="19%" ALIGN="RIGHT" VALIGN="TOP"><FONT SIZE=2><BR>
April&nbsp;28,&nbsp;2006</FONT></TD>
</TR>
<TR VALIGN="BOTTOM">
<TD WIDTH="37%" ALIGN="CENTER" VALIGN="TOP"><FONT SIZE=2><BR>
/s/&nbsp;&nbsp;</FONT><FONT SIZE=2>TIMOTHY WEINGARTEN</FONT><FONT SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</FONT><HR NOSHADE><FONT SIZE=2> Timothy Weingarten</FONT></TD>
<TD WIDTH="3%" VALIGN="TOP"><FONT SIZE=2><BR>&nbsp;</FONT></TD>
<TD WIDTH="39%" ALIGN="CENTER" VALIGN="TOP"><FONT SIZE=2><BR>
Director</FONT></TD>
<TD WIDTH="3%" VALIGN="TOP"><FONT SIZE=2><BR>&nbsp;</FONT></TD>
<TD WIDTH="19%" ALIGN="RIGHT" VALIGN="TOP"><FONT SIZE=2><BR>
April&nbsp;28,&nbsp;2006</FONT></TD>
</TR>
<TR VALIGN="BOTTOM">
<TD WIDTH="37%" ALIGN="CENTER" VALIGN="TOP"><FONT SIZE=2><BR>
/s/&nbsp;&nbsp;</FONT><FONT SIZE=2>STEVEN BROOKS</FONT><FONT SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</FONT><HR NOSHADE><FONT SIZE=2> Steven Brooks</FONT></TD>
<TD WIDTH="3%" VALIGN="TOP"><FONT SIZE=2><BR>&nbsp;</FONT></TD>
<TD WIDTH="39%" ALIGN="CENTER" VALIGN="TOP"><FONT SIZE=2><BR>
Director</FONT></TD>
<TD WIDTH="3%" VALIGN="TOP"><FONT SIZE=2><BR>&nbsp;</FONT></TD>
<TD WIDTH="19%" ALIGN="RIGHT" VALIGN="TOP"><FONT SIZE=2><BR>
April&nbsp;28,&nbsp;2006</FONT></TD>
</TR>
<TR VALIGN="BOTTOM">
<TD WIDTH="37%" ALIGN="CENTER" VALIGN="TOP"><FONT SIZE=2><BR>
/s/&nbsp;&nbsp;</FONT><FONT SIZE=2>KENNETH D. PETERSON, JR.</FONT><FONT SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</FONT><HR NOSHADE><FONT SIZE=2> Kenneth D. Peterson, Jr.</FONT></TD>
<TD WIDTH="3%" VALIGN="TOP"><FONT SIZE=2><BR>&nbsp;</FONT></TD>
<TD WIDTH="39%" ALIGN="CENTER" VALIGN="TOP"><FONT SIZE=2><BR>
Director</FONT></TD>
<TD WIDTH="3%" VALIGN="TOP"><FONT SIZE=2><BR>&nbsp;</FONT></TD>
<TD WIDTH="19%" ALIGN="RIGHT" VALIGN="TOP"><FONT SIZE=2><BR>
April&nbsp;28,&nbsp;2006</FONT></TD>
</TR>
<TR VALIGN="BOTTOM">
<TD WIDTH="37%" ALIGN="CENTER" VALIGN="TOP"><FONT SIZE=2><BR>
/s/&nbsp;&nbsp;</FONT><FONT SIZE=2>RICHARD T. LIEBHABER</FONT><FONT SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</FONT><HR NOSHADE><FONT SIZE=2> Richard T. Liebhaber</FONT></TD>
<TD WIDTH="3%" VALIGN="TOP"><FONT SIZE=2><BR>&nbsp;</FONT></TD>
<TD WIDTH="39%" ALIGN="CENTER" VALIGN="TOP"><FONT SIZE=2><BR>
Director</FONT></TD>
<TD WIDTH="3%" VALIGN="TOP"><FONT SIZE=2><BR>&nbsp;</FONT></TD>
<TD WIDTH="19%" ALIGN="RIGHT" VALIGN="TOP"><FONT SIZE=2><BR>
April&nbsp;28,&nbsp;2006</FONT></TD>
</TR>
</TABLE>

<!-- end of user-specified TAGGED TABLE -->

<P ALIGN="CENTER"><FONT SIZE=2>II-5</FONT></P>

<HR NOSHADE>
<P style='page-break-before:always'></p>
<!-- ZEQ.=1,SEQ=30,EFW="2169787",CP="COGENT COMMUNICATIONS GROUP, INC",DN="1",CHK=706371,FOLIO='II-5',FILE='DISK124:[06WDC9.06WDC1129]JC1129A.;14',USER='JENGLIS',CD=';1-MAY-2006;14:37' -->
<BR>
<!-- THIS IS THE END OF A COMPOSITION COMPONENT -->
<P ALIGN="CENTER"><FONT SIZE=2><A
NAME="page_je1129_1_6"> </A> </FONT> <FONT SIZE=2><B>SIGNATURES  </B></FONT></P>

<P>


<FONT SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Pursuant to the requirements of the Securities Act of 1933, the Registrant has duly caused this Registration Statement to be signed on its behalf by the
undersigned, thereunto duly authorized, in the District of Columbia on April&nbsp;28, 2006.

 </FONT>

</P>

<!-- User-specified TAGGED TABLE -->
<TABLE WIDTH="100%" BORDER=0 CELLSPACING=0 CELLPADDING=0>
<TR VALIGN="TOP">
<TD WIDTH="44%"><FONT SIZE=2><BR>
&nbsp;</FONT></TD>
<TD COLSPAN=3><FONT SIZE=2><BR>
COGENT COMMUNICATIONS,&nbsp;INC.</FONT></TD>
</TR>
<TR VALIGN="TOP">
<TD WIDTH="44%"><FONT SIZE=2><BR>
&nbsp;</FONT></TD>
<TD WIDTH="4%"><FONT SIZE=2><BR>
By:</FONT></TD>
<TD COLSPAN=2><FONT SIZE=2><BR>
/s/&nbsp;&nbsp;</FONT><FONT SIZE=2>DAVID SCHAEFFER</FONT><FONT SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</FONT><HR NOSHADE></TD>
</TR>
<TR VALIGN="TOP">
<TD WIDTH="44%"><FONT SIZE=2>&nbsp;</FONT></TD>
<TD WIDTH="4%"><FONT SIZE=2>&nbsp;</FONT></TD>
<TD WIDTH="8%"><FONT SIZE=2>Name:</FONT></TD>
<TD WIDTH="44%"><FONT SIZE=2>David Schaeffer</FONT></TD>
</TR>
<TR VALIGN="TOP">
<TD WIDTH="44%"><FONT SIZE=2>&nbsp;</FONT></TD>
<TD WIDTH="4%"><FONT SIZE=2>&nbsp;</FONT></TD>
<TD WIDTH="8%"><FONT SIZE=2>Title:</FONT></TD>
<TD WIDTH="44%"><FONT SIZE=2>Chief Executive Officer and Director</FONT></TD>
</TR>
</TABLE>
<!-- end of user-specified TAGGED TABLE -->


<P><FONT SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Pursuant
to the requirements of the Securities Act of 1933, this registration statement has been signed by the following persons in the capacities and on the dates indicated. </FONT></P>




<!-- User-specified TAGGED TABLE -->
<TABLE WIDTH="100%" BORDER=0 CELLSPACING=0 CELLPADDING=0>
<TR VALIGN="BOTTOM">
<TH WIDTH="32%" ALIGN="CENTER"><FONT SIZE=1><B>Signature</B></FONT><HR NOSHADE></TH>
<TH WIDTH="3%"><FONT SIZE=1>&nbsp;</FONT></TH>
<TH WIDTH="44%" ALIGN="CENTER"><FONT SIZE=1><B>Title</B></FONT><HR NOSHADE></TH>
<TH WIDTH="3%"><FONT SIZE=1>&nbsp;</FONT></TH>
<TH WIDTH="19%" ALIGN="CENTER"><FONT SIZE=1><B>Date</B></FONT><HR NOSHADE></TH>
</TR>
<TR VALIGN="TOP">
<TD WIDTH="32%" ALIGN="CENTER"><BR><FONT SIZE=2>&nbsp;</FONT></TD>
<TD WIDTH="3%"><FONT SIZE=2><BR>&nbsp;</FONT></TD>
<TD WIDTH="44%"><FONT SIZE=2><BR>
&nbsp;</FONT></TD>
<TD WIDTH="3%"><FONT SIZE=2><BR>&nbsp;</FONT></TD>
<TD WIDTH="19%"><FONT SIZE=2><BR>
&nbsp;</FONT></TD>
</TR>
<TR VALIGN="TOP">
<TD WIDTH="32%" ALIGN="CENTER"><FONT SIZE=2>/s/&nbsp;&nbsp;</FONT><FONT SIZE=2>DAVID SCHAEFFER</FONT><FONT SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</FONT><HR NOSHADE><FONT SIZE=2> David Schaeffer</FONT></TD>
<TD WIDTH="3%"><FONT SIZE=2>&nbsp;</FONT></TD>
<TD WIDTH="44%" ALIGN="CENTER"><FONT SIZE=2>Chief Executive Officer and Director<BR>
(Principal Executive Officer)</FONT></TD>
<TD WIDTH="3%"><FONT SIZE=2>&nbsp;</FONT></TD>
<TD WIDTH="19%" ALIGN="RIGHT"><FONT SIZE=2>April&nbsp;28&nbsp;2006</FONT></TD>
</TR>
<TR VALIGN="TOP">
<TD WIDTH="32%" ALIGN="CENTER"><FONT SIZE=2><BR>
/s/&nbsp;&nbsp;</FONT><FONT SIZE=2>THADDEUS G. WEED</FONT><FONT SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</FONT><HR NOSHADE><FONT SIZE=2> Thaddeus G. Weed</FONT></TD>
<TD WIDTH="3%"><FONT SIZE=2><BR>&nbsp;</FONT></TD>
<TD WIDTH="44%" ALIGN="CENTER"><FONT SIZE=2><BR>
Chief Financial Officer<BR>
(Principal&nbsp;Financial&nbsp;and&nbsp;Accounting&nbsp;Officer)</FONT></TD>
<TD WIDTH="3%"><FONT SIZE=2><BR>&nbsp;</FONT></TD>
<TD WIDTH="19%" ALIGN="RIGHT"><FONT SIZE=2><BR>
April&nbsp;28,&nbsp;2006</FONT></TD>
</TR>
</TABLE>

<!-- end of user-specified TAGGED TABLE -->

<P ALIGN="CENTER"><FONT SIZE=2>II-6</FONT></P>

<HR NOSHADE>
<P style='page-break-before:always'></p>
<!-- ZEQ.=1,SEQ=31,EFW="2169787",CP="COGENT COMMUNICATIONS GROUP, INC",DN="1",CHK=835309,FOLIO='II-6',FILE='DISK124:[06WDC9.06WDC1129]JE1129A.;14',USER='YLEE',CD=';2-MAY-2006;14:13' -->
<A NAME="page_je1129_1_7"> </A>
<P ALIGN="CENTER"><FONT SIZE=2><B>SIGNATURES  </B></FONT></P>

<P>


<FONT SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Pursuant to the requirements of the Securities Act of 1933, the Registrant has duly caused this Registration Statement to be signed on its behalf by the
undersigned, thereunto duly authorized, in the District of Columbia on April&nbsp;28, 2006.

 </FONT>

</P>

<!-- User-specified TAGGED TABLE -->
<TABLE WIDTH="100%" BORDER=0 CELLSPACING=0 CELLPADDING=0>
<TR VALIGN="TOP">
<TD WIDTH="44%"><FONT SIZE=2><BR>
&nbsp;</FONT></TD>
<TD COLSPAN=3><FONT SIZE=2><BR>
ALLIED RISER COMMUNICATIONS CORPORATION</FONT></TD>
</TR>
<TR VALIGN="TOP">
<TD WIDTH="44%"><FONT SIZE=2><BR>
&nbsp;</FONT></TD>
<TD WIDTH="4%"><FONT SIZE=2><BR>
By:</FONT></TD>
<TD COLSPAN=2><FONT SIZE=2><BR>
/s/&nbsp;&nbsp;</FONT><FONT SIZE=2>DAVID SCHAEFFER</FONT><FONT SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</FONT><HR NOSHADE></TD>
</TR>
<TR VALIGN="TOP">
<TD WIDTH="44%"><FONT SIZE=2>&nbsp;</FONT></TD>
<TD WIDTH="4%"><FONT SIZE=2>&nbsp;</FONT></TD>
<TD WIDTH="8%"><FONT SIZE=2>Name:</FONT></TD>
<TD WIDTH="44%"><FONT SIZE=2>David Schaeffer</FONT></TD>
</TR>
<TR VALIGN="TOP">
<TD WIDTH="44%"><FONT SIZE=2>&nbsp;</FONT></TD>
<TD WIDTH="4%"><FONT SIZE=2>&nbsp;</FONT></TD>
<TD WIDTH="8%"><FONT SIZE=2>Title:</FONT></TD>
<TD WIDTH="44%"><FONT SIZE=2>President, Chief Executive Officer and&nbsp;Director</FONT></TD>
</TR>
</TABLE>
<!-- end of user-specified TAGGED TABLE -->


<P><FONT SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Pursuant
to the requirements of the Securities Act of 1933, this registration statement has been signed by the following persons in the capacities and on the dates indicated. </FONT></P>




<!-- User-specified TAGGED TABLE -->
<TABLE WIDTH="100%" BORDER=0 CELLSPACING=0 CELLPADDING=0>
<TR VALIGN="BOTTOM">
<TH WIDTH="35%" ALIGN="CENTER"><FONT SIZE=1><B>Signature</B></FONT><HR NOSHADE></TH>
<TH WIDTH="2%"><FONT SIZE=1>&nbsp;</FONT></TH>
<TH WIDTH="42%" ALIGN="CENTER"><FONT SIZE=1><B>Title</B></FONT><HR NOSHADE></TH>
<TH WIDTH="2%"><FONT SIZE=1>&nbsp;</FONT></TH>
<TH WIDTH="18%" ALIGN="CENTER"><FONT SIZE=1><B>Date</B></FONT><HR NOSHADE></TH>
</TR>
<TR VALIGN="TOP">
<TD WIDTH="35%" ALIGN="CENTER"><BR><FONT SIZE=2>&nbsp;</FONT></TD>
<TD WIDTH="2%"><FONT SIZE=2><BR>&nbsp;</FONT></TD>
<TD WIDTH="42%"><FONT SIZE=2><BR>
&nbsp;</FONT></TD>
<TD WIDTH="2%"><FONT SIZE=2><BR>&nbsp;</FONT></TD>
<TD WIDTH="18%"><FONT SIZE=2><BR>
&nbsp;</FONT></TD>
</TR>
<TR VALIGN="TOP">
<TD WIDTH="35%" ALIGN="CENTER"><FONT SIZE=2>/s/&nbsp;&nbsp;</FONT><FONT SIZE=2>DAVID SCHAEFFER</FONT><FONT SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</FONT><HR NOSHADE><FONT SIZE=2> David Schaeffer</FONT></TD>
<TD WIDTH="2%"><FONT SIZE=2>&nbsp;</FONT></TD>
<TD WIDTH="42%" ALIGN="CENTER"><FONT SIZE=2>President, Chief Executive Officer and&nbsp;Director<BR>
(Principal Executive Officer)</FONT></TD>
<TD WIDTH="2%"><FONT SIZE=2>&nbsp;</FONT></TD>
<TD WIDTH="18%" ALIGN="RIGHT"><FONT SIZE=2>April&nbsp;28,&nbsp;2006</FONT></TD>
</TR>
<TR VALIGN="TOP">
<TD WIDTH="35%" ALIGN="CENTER"><FONT SIZE=2><BR>
/s/&nbsp;&nbsp;</FONT><FONT SIZE=2>THADDEUS G. WEED</FONT><FONT SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</FONT><HR NOSHADE><FONT SIZE=2> Thaddeus G. Weed</FONT></TD>
<TD WIDTH="2%"><FONT SIZE=2><BR>&nbsp;</FONT></TD>
<TD WIDTH="42%" ALIGN="CENTER"><FONT SIZE=2><BR>
Chief Financial Officer<BR>
(Principal&nbsp;Financial&nbsp;and&nbsp;Accounting&nbsp;Officer)</FONT></TD>
<TD WIDTH="2%"><FONT SIZE=2><BR>&nbsp;</FONT></TD>
<TD WIDTH="18%" ALIGN="RIGHT"><FONT SIZE=2><BR>
April&nbsp;28,&nbsp;2006</FONT></TD>
</TR>
</TABLE>

<!-- end of user-specified TAGGED TABLE -->

<P ALIGN="CENTER"><FONT SIZE=2>II-7</FONT></P>

<HR NOSHADE>
<P style='page-break-before:always'></p>
<!-- ZEQ.=2,SEQ=32,EFW="2169787",CP="COGENT COMMUNICATIONS GROUP, INC",DN="1",CHK=216635,FOLIO='II-7',FILE='DISK124:[06WDC9.06WDC1129]JE1129A.;14',USER='YLEE',CD=';2-MAY-2006;14:13' -->
<A NAME="page_je1129_1_8"> </A>
<P ALIGN="CENTER"><FONT SIZE=2><B>SIGNATURES  </B></FONT></P>

<P>


<FONT SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Pursuant to the requirements of the Securities Act of 1933, the Registrant has duly caused this Registration Statement to be signed on its behalf by the
undersigned, thereunto duly authorized, in the District of Columbia on April&nbsp;28, 2006.

 </FONT>

</P>

<!-- User-specified TAGGED TABLE -->
<TABLE WIDTH="100%" BORDER=0 CELLSPACING=0 CELLPADDING=0>
<TR VALIGN="TOP">
<TD WIDTH="44%"><FONT SIZE=2><BR>
&nbsp;</FONT></TD>
<TD COLSPAN=3><FONT SIZE=2><BR>
NETWORK EQUIPMENT SOLUTIONS, LLC</FONT></TD>
</TR>
<TR VALIGN="TOP">
<TD WIDTH="44%"><FONT SIZE=2><BR>
&nbsp;</FONT></TD>
<TD WIDTH="4%"><FONT SIZE=2><BR>
By:</FONT></TD>
<TD COLSPAN=2><FONT SIZE=2><BR>
/s/&nbsp;&nbsp;</FONT><FONT SIZE=2>DAVID SCHAEFFER</FONT><FONT SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</FONT><HR NOSHADE></TD>
</TR>
<TR VALIGN="TOP">
<TD WIDTH="44%"><FONT SIZE=2>&nbsp;</FONT></TD>
<TD WIDTH="4%"><FONT SIZE=2>&nbsp;</FONT></TD>
<TD WIDTH="8%"><FONT SIZE=2>Name:</FONT></TD>
<TD WIDTH="44%"><FONT SIZE=2>David Schaeffer</FONT></TD>
</TR>
<TR VALIGN="TOP">
<TD WIDTH="44%"><FONT SIZE=2>&nbsp;</FONT></TD>
<TD WIDTH="4%"><FONT SIZE=2>&nbsp;</FONT></TD>
<TD WIDTH="8%"><FONT SIZE=2>Title:</FONT></TD>
<TD WIDTH="44%"><FONT SIZE=2>President, Chief Executive Officer and&nbsp;Director</FONT></TD>
</TR>
</TABLE>
<!-- end of user-specified TAGGED TABLE -->


<P><FONT SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Pursuant
to the requirements of the Securities Act of 1933, this registration statement has been signed by the following persons in the capacities and on the dates indicated. </FONT></P>




<!-- User-specified TAGGED TABLE -->
<TABLE WIDTH="100%" BORDER=0 CELLSPACING=0 CELLPADDING=0>
<TR VALIGN="BOTTOM">
<TH WIDTH="35%" ALIGN="CENTER"><FONT SIZE=1><B>Signature</B></FONT><HR NOSHADE></TH>
<TH WIDTH="2%"><FONT SIZE=1>&nbsp;</FONT></TH>
<TH WIDTH="42%" ALIGN="CENTER"><FONT SIZE=1><B>Title</B></FONT><HR NOSHADE></TH>
<TH WIDTH="2%"><FONT SIZE=1>&nbsp;</FONT></TH>
<TH WIDTH="18%" ALIGN="CENTER"><FONT SIZE=1><B>Date</B></FONT><HR NOSHADE></TH>
</TR>
<TR VALIGN="TOP">
<TD WIDTH="35%" ALIGN="CENTER"><BR><FONT SIZE=2>&nbsp;</FONT></TD>
<TD WIDTH="2%"><FONT SIZE=2><BR>&nbsp;</FONT></TD>
<TD WIDTH="42%"><FONT SIZE=2><BR>
&nbsp;</FONT></TD>
<TD WIDTH="2%"><FONT SIZE=2><BR>&nbsp;</FONT></TD>
<TD WIDTH="18%"><FONT SIZE=2><BR>
&nbsp;</FONT></TD>
</TR>
<TR VALIGN="TOP">
<TD WIDTH="35%" ALIGN="CENTER"><FONT SIZE=2>/s/&nbsp;&nbsp;</FONT><FONT SIZE=2>DAVID SCHAEFFER</FONT><FONT SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</FONT><HR NOSHADE><FONT SIZE=2> David Schaeffer</FONT></TD>
<TD WIDTH="2%"><FONT SIZE=2>&nbsp;</FONT></TD>
<TD WIDTH="42%" ALIGN="CENTER"><FONT SIZE=2>President, Chief Executive Officer and&nbsp;Director<BR>
(Principal Executive Officer)</FONT></TD>
<TD WIDTH="2%"><FONT SIZE=2>&nbsp;</FONT></TD>
<TD WIDTH="18%" ALIGN="RIGHT"><FONT SIZE=2>April&nbsp;28,&nbsp;2006</FONT></TD>
</TR>
<TR VALIGN="TOP">
<TD WIDTH="35%" ALIGN="CENTER"><FONT SIZE=2><BR>
/s/&nbsp;&nbsp;</FONT><FONT SIZE=2>THADDEUS G. WEED</FONT><FONT SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</FONT><HR NOSHADE><FONT SIZE=2> Thaddeus G. Weed</FONT></TD>
<TD WIDTH="2%"><FONT SIZE=2><BR>&nbsp;</FONT></TD>
<TD WIDTH="42%" ALIGN="CENTER"><FONT SIZE=2><BR>
Chief Financial Officer<BR>
(Principal&nbsp;Financial&nbsp;and&nbsp;Accounting&nbsp;Officer)</FONT></TD>
<TD WIDTH="2%"><FONT SIZE=2><BR>&nbsp;</FONT></TD>
<TD WIDTH="18%" ALIGN="RIGHT"><FONT SIZE=2><BR>
April&nbsp;28,&nbsp;2006</FONT></TD>
</TR>
</TABLE>

<!-- end of user-specified TAGGED TABLE -->

<P ALIGN="CENTER"><FONT SIZE=2>II-8</FONT></P>

<HR NOSHADE>
<P style='page-break-before:always'></p>
<!-- ZEQ.=3,SEQ=33,EFW="2169787",CP="COGENT COMMUNICATIONS GROUP, INC",DN="1",CHK=48060,FOLIO='II-8',FILE='DISK124:[06WDC9.06WDC1129]JE1129A.;14',USER='YLEE',CD=';2-MAY-2006;14:13' -->
<A NAME="page_je1129_1_9"> </A>
<P ALIGN="CENTER"><FONT SIZE=2><B>SIGNATURES  </B></FONT></P>

<P>


<FONT SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Pursuant to the requirements of the Securities Act of 1933, the Registrant has duly caused this Registration Statement to be signed on its behalf by the
undersigned, thereunto duly authorized, in the District of Columbia on April&nbsp;28, 2006.

 </FONT>

</P>

<!-- User-specified TAGGED TABLE -->
<TABLE WIDTH="100%" BORDER=0 CELLSPACING=0 CELLPADDING=0>
<TR VALIGN="TOP">
<TD WIDTH="44%"><FONT SIZE=2><BR>
&nbsp;</FONT></TD>
<TD COLSPAN=3><FONT SIZE=2><BR>
UFO GROUP,&nbsp;INC.</FONT></TD>
</TR>
<TR VALIGN="TOP">
<TD WIDTH="44%"><FONT SIZE=2><BR>
&nbsp;</FONT></TD>
<TD WIDTH="4%"><FONT SIZE=2><BR>
By:</FONT></TD>
<TD COLSPAN=2><FONT SIZE=2><BR>
/s/&nbsp;&nbsp;</FONT><FONT SIZE=2>DAVID SCHAEFFER</FONT><FONT SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</FONT><HR NOSHADE></TD>
</TR>
<TR VALIGN="TOP">
<TD WIDTH="44%"><FONT SIZE=2>&nbsp;</FONT></TD>
<TD WIDTH="4%"><FONT SIZE=2>&nbsp;</FONT></TD>
<TD WIDTH="8%"><FONT SIZE=2>Name:</FONT></TD>
<TD WIDTH="44%"><FONT SIZE=2>David Schaeffer</FONT></TD>
</TR>
<TR VALIGN="TOP">
<TD WIDTH="44%"><FONT SIZE=2>&nbsp;</FONT></TD>
<TD WIDTH="4%"><FONT SIZE=2>&nbsp;</FONT></TD>
<TD WIDTH="8%"><FONT SIZE=2>Title:</FONT></TD>
<TD WIDTH="44%"><FONT SIZE=2>President, Chief Executive Officer and&nbsp;Director</FONT></TD>
</TR>
</TABLE>
<!-- end of user-specified TAGGED TABLE -->


<P><FONT SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Pursuant
to the requirements of the Securities Act of 1933, this registration statement has been signed by the following persons in the capacities and on the dates indicated. </FONT></P>




<!-- User-specified TAGGED TABLE -->
<TABLE WIDTH="100%" BORDER=0 CELLSPACING=0 CELLPADDING=0>
<TR VALIGN="BOTTOM">
<TH WIDTH="35%" ALIGN="CENTER"><FONT SIZE=1><B>Signature</B></FONT><HR NOSHADE></TH>
<TH WIDTH="2%"><FONT SIZE=1>&nbsp;</FONT></TH>
<TH WIDTH="42%" ALIGN="CENTER"><FONT SIZE=1><B>Title</B></FONT><HR NOSHADE></TH>
<TH WIDTH="2%"><FONT SIZE=1>&nbsp;</FONT></TH>
<TH WIDTH="18%" ALIGN="CENTER"><FONT SIZE=1><B>Date</B></FONT><HR NOSHADE></TH>
</TR>
<TR VALIGN="TOP">
<TD WIDTH="35%" ALIGN="CENTER"><BR><FONT SIZE=2>&nbsp;</FONT></TD>
<TD WIDTH="2%"><FONT SIZE=2><BR>&nbsp;</FONT></TD>
<TD WIDTH="42%"><FONT SIZE=2><BR>
&nbsp;</FONT></TD>
<TD WIDTH="2%"><FONT SIZE=2><BR>&nbsp;</FONT></TD>
<TD WIDTH="18%"><FONT SIZE=2><BR>
&nbsp;</FONT></TD>
</TR>
<TR VALIGN="TOP">
<TD WIDTH="35%" ALIGN="CENTER"><FONT SIZE=2>/s/&nbsp;&nbsp;</FONT><FONT SIZE=2>DAVID SCHAEFFER</FONT><FONT SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</FONT><HR NOSHADE><FONT SIZE=2> David Schaeffer</FONT></TD>
<TD WIDTH="2%"><FONT SIZE=2>&nbsp;</FONT></TD>
<TD WIDTH="42%" ALIGN="CENTER"><FONT SIZE=2>President, Chief Executive Officer and&nbsp;Director<BR>
(Principal Executive Officer)</FONT></TD>
<TD WIDTH="2%"><FONT SIZE=2>&nbsp;</FONT></TD>
<TD WIDTH="18%" ALIGN="RIGHT"><FONT SIZE=2>April&nbsp;28,&nbsp;2006</FONT></TD>
</TR>
<TR VALIGN="TOP">
<TD WIDTH="35%" ALIGN="CENTER"><FONT SIZE=2><BR>
/s/&nbsp;&nbsp;</FONT><FONT SIZE=2>THADDEUS G. WEED</FONT><FONT SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</FONT><HR NOSHADE><FONT SIZE=2> Thaddeus G. Weed</FONT></TD>
<TD WIDTH="2%"><FONT SIZE=2><BR>&nbsp;</FONT></TD>
<TD WIDTH="42%" ALIGN="CENTER"><FONT SIZE=2><BR>
Chief Financial Officer<BR>
(Principal&nbsp;Financial&nbsp;and&nbsp;Accounting&nbsp;Officer)</FONT></TD>
<TD WIDTH="2%"><FONT SIZE=2><BR>&nbsp;</FONT></TD>
<TD WIDTH="18%" ALIGN="RIGHT"><FONT SIZE=2><BR>
April&nbsp;28,&nbsp;2006</FONT></TD>
</TR>
</TABLE>

<!-- end of user-specified TAGGED TABLE -->

<P ALIGN="CENTER"><FONT SIZE=2>II-9</FONT></P>

<HR NOSHADE>
<P style='page-break-before:always'></p>
<!-- ZEQ.=4,SEQ=34,EFW="2169787",CP="COGENT COMMUNICATIONS GROUP, INC",DN="1",CHK=501564,FOLIO='II-9',FILE='DISK124:[06WDC9.06WDC1129]JE1129A.;14',USER='YLEE',CD=';2-MAY-2006;14:13' -->
<A NAME="page_je1129_1_10"> </A>
<P ALIGN="CENTER"><FONT SIZE=2><B>SIGNATURES  </B></FONT></P>

<P>


<FONT SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Pursuant to the requirements of the Securities Act of 1933, the Registrant has duly caused this Registration Statement to be signed on its behalf by the
undersigned, thereunto duly authorized, in the District of Columbia on April&nbsp;28, 2006.

 </FONT>

</P>

<!-- User-specified TAGGED TABLE -->
<TABLE WIDTH="100%" BORDER=0 CELLSPACING=0 CELLPADDING=0>
<TR VALIGN="TOP">
<TD WIDTH="44%"><FONT SIZE=2><BR>
&nbsp;</FONT></TD>
<TD COLSPAN=3><FONT SIZE=2><BR>
SYMPOSIUM GAMMA,&nbsp;INC.</FONT></TD>
</TR>
<TR VALIGN="TOP">
<TD WIDTH="44%"><FONT SIZE=2><BR>
&nbsp;</FONT></TD>
<TD WIDTH="4%"><FONT SIZE=2><BR>
By:</FONT></TD>
<TD COLSPAN=2><FONT SIZE=2><BR>
/s/&nbsp;&nbsp;</FONT><FONT SIZE=2>DAVID SCHAEFFER</FONT><FONT SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</FONT><HR NOSHADE></TD>
</TR>
<TR VALIGN="TOP">
<TD WIDTH="44%"><FONT SIZE=2>&nbsp;</FONT></TD>
<TD WIDTH="4%"><FONT SIZE=2>&nbsp;</FONT></TD>
<TD WIDTH="8%"><FONT SIZE=2>Name:</FONT></TD>
<TD WIDTH="44%"><FONT SIZE=2>David Schaeffer</FONT></TD>
</TR>
<TR VALIGN="TOP">
<TD WIDTH="44%"><FONT SIZE=2>&nbsp;</FONT></TD>
<TD WIDTH="4%"><FONT SIZE=2>&nbsp;</FONT></TD>
<TD WIDTH="8%"><FONT SIZE=2>Title:</FONT></TD>
<TD WIDTH="44%"><FONT SIZE=2>Chief Executive Officer and&nbsp;Director</FONT></TD>
</TR>
</TABLE>
<!-- end of user-specified TAGGED TABLE -->


<P><FONT SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Pursuant
to the requirements of the Securities Act of 1933, this registration statement has been signed by the following persons in the capacities and on the dates indicated. </FONT></P>




<!-- User-specified TAGGED TABLE -->
<TABLE WIDTH="100%" BORDER=0 CELLSPACING=0 CELLPADDING=0>
<TR VALIGN="BOTTOM">
<TH WIDTH="35%" ALIGN="CENTER"><FONT SIZE=1><B>Signature</B></FONT><HR NOSHADE></TH>
<TH WIDTH="2%"><FONT SIZE=1>&nbsp;</FONT></TH>
<TH WIDTH="42%" ALIGN="CENTER"><FONT SIZE=1><B>Title</B></FONT><HR NOSHADE></TH>
<TH WIDTH="2%"><FONT SIZE=1>&nbsp;</FONT></TH>
<TH WIDTH="18%" ALIGN="CENTER"><FONT SIZE=1><B>Date</B></FONT><HR NOSHADE></TH>
</TR>
<TR VALIGN="TOP">
<TD WIDTH="35%" ALIGN="CENTER"><BR><FONT SIZE=2>&nbsp;</FONT></TD>
<TD WIDTH="2%"><FONT SIZE=2><BR>&nbsp;</FONT></TD>
<TD WIDTH="42%"><FONT SIZE=2><BR>
&nbsp;</FONT></TD>
<TD WIDTH="2%"><FONT SIZE=2><BR>&nbsp;</FONT></TD>
<TD WIDTH="18%"><FONT SIZE=2><BR>
&nbsp;</FONT></TD>
</TR>
<TR VALIGN="TOP">
<TD WIDTH="35%" ALIGN="CENTER"><FONT SIZE=2>/s/&nbsp;&nbsp;</FONT><FONT SIZE=2>DAVID SCHAEFFER</FONT><FONT SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</FONT><HR NOSHADE><FONT SIZE=2> David Schaeffer</FONT></TD>
<TD WIDTH="2%"><FONT SIZE=2>&nbsp;</FONT></TD>
<TD WIDTH="42%" ALIGN="CENTER"><FONT SIZE=2>Chief Executive Officer and&nbsp;Director<BR>
(Principal Executive Officer)</FONT></TD>
<TD WIDTH="2%"><FONT SIZE=2>&nbsp;</FONT></TD>
<TD WIDTH="18%" ALIGN="RIGHT"><FONT SIZE=2>April&nbsp;28,&nbsp;2006</FONT></TD>
</TR>
<TR VALIGN="TOP">
<TD WIDTH="35%" ALIGN="CENTER"><FONT SIZE=2><BR>
/s/&nbsp;&nbsp;</FONT><FONT SIZE=2>THADDEUS G. WEED</FONT><FONT SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</FONT><HR NOSHADE><FONT SIZE=2> Thaddeus G. Weed</FONT></TD>
<TD WIDTH="2%"><FONT SIZE=2><BR>&nbsp;</FONT></TD>
<TD WIDTH="42%" ALIGN="CENTER"><FONT SIZE=2><BR>
Chief Financial Officer<BR>
(Principal&nbsp;Financial&nbsp;and&nbsp;Accounting&nbsp;Officer)</FONT></TD>
<TD WIDTH="2%"><FONT SIZE=2><BR>&nbsp;</FONT></TD>
<TD WIDTH="18%" ALIGN="RIGHT"><FONT SIZE=2><BR>
April&nbsp;28,&nbsp;2006</FONT></TD>
</TR>
</TABLE>

<!-- end of user-specified TAGGED TABLE -->

<P ALIGN="CENTER"><FONT SIZE=2>II-10</FONT></P>

<HR NOSHADE>
<P style='page-break-before:always'></p>
<!-- ZEQ.=5,SEQ=35,EFW="2169787",CP="COGENT COMMUNICATIONS GROUP, INC",DN="1",CHK=298619,FOLIO='II-10',FILE='DISK124:[06WDC9.06WDC1129]JE1129A.;14',USER='YLEE',CD=';2-MAY-2006;14:13' -->
<!-- THIS IS THE END OF A COMPOSITION COMPONENT -->
<P ALIGN="CENTER"><FONT SIZE=2><A
NAME="page_jg1129_1_11"> </A> </FONT> <FONT SIZE=2><B>SIGNATURES  </B></FONT></P>

<P>


<FONT SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Pursuant to the requirements of the Securities Act of 1933, the Registrant has duly caused this Registration Statement to be signed on its behalf by the
undersigned, thereunto duly authorized, in the District of Columbia on April&nbsp;28, 2006.

 </FONT>

</P>

<!-- User-specified TAGGED TABLE -->
<TABLE WIDTH="100%" BORDER=0 CELLSPACING=0 CELLPADDING=0>
<TR VALIGN="TOP">
<TD WIDTH="42%"><FONT SIZE=2><BR>
&nbsp;</FONT></TD>
<TD COLSPAN=3><FONT SIZE=2><BR>
COGENT COMMUNICATIONS OF CALIFORNIA,&nbsp;INC.</FONT></TD>
</TR>
<TR VALIGN="TOP">
<TD WIDTH="42%"><FONT SIZE=2><BR>
&nbsp;</FONT></TD>
<TD WIDTH="4%"><FONT SIZE=2><BR>
By:</FONT></TD>
<TD COLSPAN=2><FONT SIZE=2><BR>
/s/&nbsp;&nbsp;</FONT><FONT SIZE=2>DAVID SCHAEFFER</FONT><FONT SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</FONT><HR NOSHADE></TD>
</TR>
<TR VALIGN="TOP">
<TD WIDTH="42%"><FONT SIZE=2>&nbsp;</FONT></TD>
<TD WIDTH="4%"><FONT SIZE=2>&nbsp;</FONT></TD>
<TD WIDTH="8%"><FONT SIZE=2>Name:</FONT></TD>
<TD WIDTH="46%"><FONT SIZE=2>David Schaeffer</FONT></TD>
</TR>
<TR VALIGN="TOP">
<TD WIDTH="42%"><FONT SIZE=2>&nbsp;</FONT></TD>
<TD WIDTH="4%"><FONT SIZE=2>&nbsp;</FONT></TD>
<TD WIDTH="8%"><FONT SIZE=2>Title:</FONT></TD>
<TD WIDTH="46%"><FONT SIZE=2>President, Chief Executive Officer and&nbsp;Director</FONT></TD>
</TR>
</TABLE>
<!-- end of user-specified TAGGED TABLE -->


<P><FONT SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Pursuant
to the requirements of the Securities Act of 1933, this registration statement has been signed by the following persons in the capacities and on the dates indicated. </FONT></P>




<!-- User-specified TAGGED TABLE -->
<TABLE WIDTH="100%" BORDER=0 CELLSPACING=0 CELLPADDING=0>
<TR VALIGN="BOTTOM">
<TH WIDTH="32%" ALIGN="CENTER"><FONT SIZE=1><B>Signature</B></FONT><HR NOSHADE></TH>
<TH WIDTH="3%"><FONT SIZE=1>&nbsp;</FONT></TH>
<TH WIDTH="44%" ALIGN="CENTER"><FONT SIZE=1><B>Title</B></FONT><HR NOSHADE></TH>
<TH WIDTH="3%"><FONT SIZE=1>&nbsp;</FONT></TH>
<TH WIDTH="19%" ALIGN="CENTER"><FONT SIZE=1><B>Date</B></FONT><HR NOSHADE></TH>
</TR>
<TR VALIGN="TOP">
<TD WIDTH="32%" ALIGN="CENTER"><BR><FONT SIZE=2>&nbsp;</FONT></TD>
<TD WIDTH="3%"><FONT SIZE=2><BR>&nbsp;</FONT></TD>
<TD WIDTH="44%"><FONT SIZE=2><BR>
&nbsp;</FONT></TD>
<TD WIDTH="3%"><FONT SIZE=2><BR>&nbsp;</FONT></TD>
<TD WIDTH="19%"><FONT SIZE=2><BR>
&nbsp;</FONT></TD>
</TR>
<TR VALIGN="TOP">
<TD WIDTH="32%" ALIGN="CENTER"><FONT SIZE=2>/s/&nbsp;&nbsp;</FONT><FONT SIZE=2>DAVID SCHAEFFER</FONT><FONT SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</FONT><HR NOSHADE><FONT SIZE=2> David Schaeffer</FONT></TD>
<TD WIDTH="3%"><FONT SIZE=2>&nbsp;</FONT></TD>
<TD WIDTH="44%" ALIGN="CENTER"><FONT SIZE=2>President, Chief Executive Officer and&nbsp;Director<BR>
(Principal Executive Officer)</FONT></TD>
<TD WIDTH="3%"><FONT SIZE=2>&nbsp;</FONT></TD>
<TD WIDTH="19%" ALIGN="RIGHT"><FONT SIZE=2>April&nbsp;28,&nbsp;2006</FONT></TD>
</TR>
<TR VALIGN="TOP">
<TD WIDTH="32%" ALIGN="CENTER"><FONT SIZE=2><BR>
/s/&nbsp;&nbsp;</FONT><FONT SIZE=2>THADDEUS G. WEED</FONT><FONT SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</FONT><HR NOSHADE><FONT SIZE=2> Thaddeus G. Weed</FONT></TD>
<TD WIDTH="3%"><FONT SIZE=2><BR>&nbsp;</FONT></TD>
<TD WIDTH="44%" ALIGN="CENTER"><FONT SIZE=2><BR>
Chief Financial Officer<BR>
(Principal&nbsp;Financial&nbsp;and&nbsp;Accounting&nbsp;Officer)</FONT></TD>
<TD WIDTH="3%"><FONT SIZE=2><BR>&nbsp;</FONT></TD>
<TD WIDTH="19%" ALIGN="RIGHT"><FONT SIZE=2><BR>
April&nbsp;28,&nbsp;2006</FONT></TD>
</TR>
</TABLE>

<!-- end of user-specified TAGGED TABLE -->

<P ALIGN="CENTER"><FONT SIZE=2>II-11</FONT></P>

<HR NOSHADE>
<P style='page-break-before:always'></p>
<!-- ZEQ.=1,SEQ=36,EFW="2169787",CP="COGENT COMMUNICATIONS GROUP, INC",DN="1",CHK=1011359,FOLIO='II-11',FILE='DISK124:[06WDC9.06WDC1129]JG1129A.;12',USER='YLEE',CD=';2-MAY-2006;14:13' -->
<A NAME="page_jg1129_1_12"> </A>
<P ALIGN="CENTER"><FONT SIZE=2><B>SIGNATURES  </B></FONT></P>

<P>


<FONT SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Pursuant to the requirements of the Securities Act of 1933, the Registrant has duly caused this Registration Statement to be signed on its behalf by the
undersigned, thereunto duly authorized, in the District of Columbia on April&nbsp;28, 2006.

 </FONT>

</P>

<!-- User-specified TAGGED TABLE -->
<TABLE WIDTH="100%" BORDER=0 CELLSPACING=0 CELLPADDING=0>
<TR VALIGN="TOP">
<TD WIDTH="44%"><FONT SIZE=2><BR>
&nbsp;</FONT></TD>
<TD COLSPAN=3><FONT SIZE=2><BR>
COGENT COMMUNICATIONS OF D.C.,&nbsp;INC.</FONT></TD>
</TR>
<TR VALIGN="TOP">
<TD WIDTH="44%"><FONT SIZE=2><BR>
&nbsp;</FONT></TD>
<TD WIDTH="4%"><FONT SIZE=2><BR>
By:</FONT></TD>
<TD COLSPAN=2><FONT SIZE=2><BR>
/s/&nbsp;&nbsp;</FONT><FONT SIZE=2>DAVID SCHAEFFER</FONT><FONT SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</FONT><HR NOSHADE></TD>
</TR>
<TR VALIGN="TOP">
<TD WIDTH="44%"><FONT SIZE=2>&nbsp;</FONT></TD>
<TD WIDTH="4%"><FONT SIZE=2>&nbsp;</FONT></TD>
<TD WIDTH="8%"><FONT SIZE=2>Name:</FONT></TD>
<TD WIDTH="44%"><FONT SIZE=2>David Schaeffer</FONT></TD>
</TR>
<TR VALIGN="TOP">
<TD WIDTH="44%"><FONT SIZE=2>&nbsp;</FONT></TD>
<TD WIDTH="4%"><FONT SIZE=2>&nbsp;</FONT></TD>
<TD WIDTH="8%"><FONT SIZE=2>Title:</FONT></TD>
<TD WIDTH="44%"><FONT SIZE=2>President, Chief Executive Officer and&nbsp;Director</FONT></TD>
</TR>
</TABLE>
<!-- end of user-specified TAGGED TABLE -->


<P><FONT SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Pursuant
to the requirements of the Securities Act of 1933, this registration statement has been signed by the following persons in the capacities and on the dates indicated. </FONT></P>




<!-- User-specified TAGGED TABLE -->
<TABLE WIDTH="100%" BORDER=0 CELLSPACING=0 CELLPADDING=0>
<TR VALIGN="BOTTOM">
<TH WIDTH="32%" ALIGN="CENTER"><FONT SIZE=1><B>Signature</B></FONT><HR NOSHADE></TH>
<TH WIDTH="3%"><FONT SIZE=1>&nbsp;</FONT></TH>
<TH WIDTH="44%" ALIGN="CENTER"><FONT SIZE=1><B>Title</B></FONT><HR NOSHADE></TH>
<TH WIDTH="3%"><FONT SIZE=1>&nbsp;</FONT></TH>
<TH WIDTH="19%" ALIGN="CENTER"><FONT SIZE=1><B>Date</B></FONT><HR NOSHADE></TH>
</TR>
<TR VALIGN="TOP">
<TD WIDTH="32%" ALIGN="CENTER"><BR><FONT SIZE=2>&nbsp;</FONT></TD>
<TD WIDTH="3%"><FONT SIZE=2><BR>&nbsp;</FONT></TD>
<TD WIDTH="44%"><FONT SIZE=2><BR>
&nbsp;</FONT></TD>
<TD WIDTH="3%"><FONT SIZE=2><BR>&nbsp;</FONT></TD>
<TD WIDTH="19%"><FONT SIZE=2><BR>
&nbsp;</FONT></TD>
</TR>
<TR VALIGN="TOP">
<TD WIDTH="32%" ALIGN="CENTER"><FONT SIZE=2>/s/&nbsp;&nbsp;</FONT><FONT SIZE=2>DAVID SCHAEFFER</FONT><FONT SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</FONT><HR NOSHADE><FONT SIZE=2> David Schaeffer</FONT></TD>
<TD WIDTH="3%"><FONT SIZE=2>&nbsp;</FONT></TD>
<TD WIDTH="44%" ALIGN="CENTER"><FONT SIZE=2>President, Chief Executive Officer and&nbsp;Director<BR>
(Principal Executive Officer)</FONT></TD>
<TD WIDTH="3%"><FONT SIZE=2>&nbsp;</FONT></TD>
<TD WIDTH="19%" ALIGN="RIGHT"><FONT SIZE=2>April&nbsp;28,&nbsp;2006</FONT></TD>
</TR>
<TR VALIGN="TOP">
<TD WIDTH="32%" ALIGN="CENTER"><FONT SIZE=2><BR>
/s/&nbsp;&nbsp;</FONT><FONT SIZE=2>THADDEUS G. WEED</FONT><FONT SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</FONT><HR NOSHADE><FONT SIZE=2> Thaddeus G. Weed</FONT></TD>
<TD WIDTH="3%"><FONT SIZE=2><BR>&nbsp;</FONT></TD>
<TD WIDTH="44%" ALIGN="CENTER"><FONT SIZE=2><BR>
Chief Financial Officer<BR>
(Principal&nbsp;Financial&nbsp;and&nbsp;Accounting&nbsp;Officer)</FONT></TD>
<TD WIDTH="3%"><FONT SIZE=2><BR>&nbsp;</FONT></TD>
<TD WIDTH="19%" ALIGN="RIGHT"><FONT SIZE=2><BR>
April&nbsp;28,&nbsp;2006</FONT></TD>
</TR>
</TABLE>

<!-- end of user-specified TAGGED TABLE -->

<P ALIGN="CENTER"><FONT SIZE=2>II-12</FONT></P>

<HR NOSHADE>
<P style='page-break-before:always'></p>
<!-- ZEQ.=2,SEQ=37,EFW="2169787",CP="COGENT COMMUNICATIONS GROUP, INC",DN="1",CHK=734323,FOLIO='II-12',FILE='DISK124:[06WDC9.06WDC1129]JG1129A.;12',USER='YLEE',CD=';2-MAY-2006;14:13' -->
<A NAME="page_jg1129_1_13"> </A>
<P ALIGN="CENTER"><FONT SIZE=2><B>SIGNATURES  </B></FONT></P>

<P>


<FONT SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Pursuant to the requirements of the Securities Act of 1933, the Registrant has duly caused this Registration Statement to be signed on its behalf by the
undersigned, thereunto duly authorized, in the District of Columbia on April&nbsp;28, 2006.

 </FONT>

</P>

<!-- User-specified TAGGED TABLE -->
<TABLE WIDTH="100%" BORDER=0 CELLSPACING=0 CELLPADDING=0>
<TR VALIGN="TOP">
<TD WIDTH="44%"><FONT SIZE=2><BR>
&nbsp;</FONT></TD>
<TD COLSPAN=3><FONT SIZE=2><BR>
COGENT COMMUNICATIONS OF FLORIDA,&nbsp;INC.</FONT></TD>
</TR>
<TR VALIGN="TOP">
<TD WIDTH="44%"><FONT SIZE=2><BR>
&nbsp;</FONT></TD>
<TD WIDTH="4%"><FONT SIZE=2><BR>
By:</FONT></TD>
<TD COLSPAN=2><FONT SIZE=2><BR>
/s/&nbsp;&nbsp;</FONT><FONT SIZE=2>DAVID SCHAEFFER</FONT><FONT SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</FONT><HR NOSHADE></TD>
</TR>
<TR VALIGN="TOP">
<TD WIDTH="44%"><FONT SIZE=2>&nbsp;</FONT></TD>
<TD WIDTH="4%"><FONT SIZE=2>&nbsp;</FONT></TD>
<TD WIDTH="8%"><FONT SIZE=2>Name:</FONT></TD>
<TD WIDTH="44%"><FONT SIZE=2>David Schaeffer</FONT></TD>
</TR>
<TR VALIGN="TOP">
<TD WIDTH="44%"><FONT SIZE=2>&nbsp;</FONT></TD>
<TD WIDTH="4%"><FONT SIZE=2>&nbsp;</FONT></TD>
<TD WIDTH="8%"><FONT SIZE=2>Title:</FONT></TD>
<TD WIDTH="44%"><FONT SIZE=2>President, Chief Executive Officer and&nbsp;Director</FONT></TD>
</TR>
</TABLE>
<!-- end of user-specified TAGGED TABLE -->


<P><FONT SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Pursuant
to the requirements of the Securities Act of 1933, this registration statement has been signed by the following persons in the capacities and on the dates indicated. </FONT></P>




<!-- User-specified TAGGED TABLE -->
<TABLE WIDTH="100%" BORDER=0 CELLSPACING=0 CELLPADDING=0>
<TR VALIGN="BOTTOM">
<TH WIDTH="32%" ALIGN="CENTER"><FONT SIZE=1><B>Signature</B></FONT><HR NOSHADE></TH>
<TH WIDTH="3%"><FONT SIZE=1>&nbsp;</FONT></TH>
<TH WIDTH="44%" ALIGN="CENTER"><FONT SIZE=1><B>Title</B></FONT><HR NOSHADE></TH>
<TH WIDTH="3%"><FONT SIZE=1>&nbsp;</FONT></TH>
<TH WIDTH="19%" ALIGN="CENTER"><FONT SIZE=1><B>Date</B></FONT><HR NOSHADE></TH>
</TR>
<TR VALIGN="TOP">
<TD WIDTH="32%" ALIGN="CENTER"><BR><FONT SIZE=2>&nbsp;</FONT></TD>
<TD WIDTH="3%"><FONT SIZE=2><BR>&nbsp;</FONT></TD>
<TD WIDTH="44%"><FONT SIZE=2><BR>
&nbsp;</FONT></TD>
<TD WIDTH="3%"><FONT SIZE=2><BR>&nbsp;</FONT></TD>
<TD WIDTH="19%"><FONT SIZE=2><BR>
&nbsp;</FONT></TD>
</TR>
<TR VALIGN="TOP">
<TD WIDTH="32%" ALIGN="CENTER"><FONT SIZE=2>/s/&nbsp;&nbsp;</FONT><FONT SIZE=2>DAVID SCHAEFFER</FONT><FONT SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</FONT><HR NOSHADE><FONT SIZE=2> David Schaeffer</FONT></TD>
<TD WIDTH="3%"><FONT SIZE=2>&nbsp;</FONT></TD>
<TD WIDTH="44%" ALIGN="CENTER"><FONT SIZE=2>President, Chief Executive Officer and&nbsp;Director<BR>
(Principal Executive Officer)</FONT></TD>
<TD WIDTH="3%"><FONT SIZE=2>&nbsp;</FONT></TD>
<TD WIDTH="19%" ALIGN="RIGHT"><FONT SIZE=2>April&nbsp;28,&nbsp;2006</FONT></TD>
</TR>
<TR VALIGN="TOP">
<TD WIDTH="32%" ALIGN="CENTER"><FONT SIZE=2><BR>
/s/&nbsp;&nbsp;</FONT><FONT SIZE=2>THADDEUS G. WEED</FONT><FONT SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</FONT><HR NOSHADE><FONT SIZE=2> Thaddeus G. Weed</FONT></TD>
<TD WIDTH="3%"><FONT SIZE=2><BR>&nbsp;</FONT></TD>
<TD WIDTH="44%" ALIGN="CENTER"><FONT SIZE=2><BR>
Chief Financial Officer<BR>
(Principal&nbsp;Financial&nbsp;and&nbsp;Accounting&nbsp;Officer)</FONT></TD>
<TD WIDTH="3%"><FONT SIZE=2><BR>&nbsp;</FONT></TD>
<TD WIDTH="19%" ALIGN="RIGHT"><FONT SIZE=2><BR>
April&nbsp;28,&nbsp;2006</FONT></TD>
</TR>
</TABLE>

<!-- end of user-specified TAGGED TABLE -->

<P ALIGN="CENTER"><FONT SIZE=2>II-13</FONT></P>

<HR NOSHADE>
<P style='page-break-before:always'></p>
<!-- ZEQ.=3,SEQ=38,EFW="2169787",CP="COGENT COMMUNICATIONS GROUP, INC",DN="1",CHK=1011369,FOLIO='II-13',FILE='DISK124:[06WDC9.06WDC1129]JG1129A.;12',USER='YLEE',CD=';2-MAY-2006;14:13' -->
<A NAME="page_jg1129_1_14"> </A>
<P ALIGN="CENTER"><FONT SIZE=2><B>SIGNATURES  </B></FONT></P>

<P>


<FONT SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Pursuant to the requirements of the Securities Act of 1933, the Registrant has duly caused this Registration Statement to be signed on its behalf by the
undersigned, thereunto duly authorized, in the District of Columbia on April&nbsp;28, 2006.

 </FONT>

</P>

<!-- User-specified TAGGED TABLE -->
<TABLE WIDTH="100%" BORDER=0 CELLSPACING=0 CELLPADDING=0>
<TR VALIGN="TOP">
<TD WIDTH="44%"><FONT SIZE=2><BR>
&nbsp;</FONT></TD>
<TD COLSPAN=3><FONT SIZE=2><BR>
COGENT COMMUNICATIONS OF GEORGIA,&nbsp;INC.</FONT></TD>
</TR>
<TR VALIGN="TOP">
<TD WIDTH="44%"><FONT SIZE=2><BR>
&nbsp;</FONT></TD>
<TD WIDTH="4%"><FONT SIZE=2><BR>
By:</FONT></TD>
<TD COLSPAN=2><FONT SIZE=2><BR>
/s/&nbsp;&nbsp;</FONT><FONT SIZE=2>DAVID SCHAEFFER</FONT><FONT SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</FONT><HR NOSHADE></TD>
</TR>
<TR VALIGN="TOP">
<TD WIDTH="44%"><FONT SIZE=2>&nbsp;</FONT></TD>
<TD WIDTH="4%"><FONT SIZE=2>&nbsp;</FONT></TD>
<TD WIDTH="8%"><FONT SIZE=2>Name:</FONT></TD>
<TD WIDTH="44%"><FONT SIZE=2>David Schaeffer</FONT></TD>
</TR>
<TR VALIGN="TOP">
<TD WIDTH="44%"><FONT SIZE=2>&nbsp;</FONT></TD>
<TD WIDTH="4%"><FONT SIZE=2>&nbsp;</FONT></TD>
<TD WIDTH="8%"><FONT SIZE=2>Title:</FONT></TD>
<TD WIDTH="44%"><FONT SIZE=2>President, Chief Executive Officer and&nbsp;Director</FONT></TD>
</TR>
</TABLE>
<!-- end of user-specified TAGGED TABLE -->


<P><FONT SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Pursuant
to the requirements of the Securities Act of 1933, this registration statement has been signed by the following persons in the capacities and on the dates indicated. </FONT></P>




<!-- User-specified TAGGED TABLE -->
<TABLE WIDTH="100%" BORDER=0 CELLSPACING=0 CELLPADDING=0>
<TR VALIGN="BOTTOM">
<TH WIDTH="32%" ALIGN="CENTER"><FONT SIZE=1><B>Signature</B></FONT><HR NOSHADE></TH>
<TH WIDTH="3%"><FONT SIZE=1>&nbsp;</FONT></TH>
<TH WIDTH="44%" ALIGN="CENTER"><FONT SIZE=1><B>Title</B></FONT><HR NOSHADE></TH>
<TH WIDTH="3%"><FONT SIZE=1>&nbsp;</FONT></TH>
<TH WIDTH="19%" ALIGN="CENTER"><FONT SIZE=1><B>Date</B></FONT><HR NOSHADE></TH>
</TR>
<TR VALIGN="TOP">
<TD WIDTH="32%" ALIGN="CENTER"><BR><FONT SIZE=2>&nbsp;</FONT></TD>
<TD WIDTH="3%"><FONT SIZE=2><BR>&nbsp;</FONT></TD>
<TD WIDTH="44%"><FONT SIZE=2><BR>
&nbsp;</FONT></TD>
<TD WIDTH="3%"><FONT SIZE=2><BR>&nbsp;</FONT></TD>
<TD WIDTH="19%"><FONT SIZE=2><BR>
&nbsp;</FONT></TD>
</TR>
<TR VALIGN="TOP">
<TD WIDTH="32%" ALIGN="CENTER"><FONT SIZE=2>/s/&nbsp;&nbsp;</FONT><FONT SIZE=2>DAVID SCHAEFFER</FONT><FONT SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</FONT><HR NOSHADE><FONT SIZE=2> David Schaeffer</FONT></TD>
<TD WIDTH="3%"><FONT SIZE=2>&nbsp;</FONT></TD>
<TD WIDTH="44%" ALIGN="CENTER"><FONT SIZE=2>President, Chief Executive Officer and&nbsp;Director<BR>
(Principal Executive Officer)</FONT></TD>
<TD WIDTH="3%"><FONT SIZE=2>&nbsp;</FONT></TD>
<TD WIDTH="19%" ALIGN="RIGHT"><FONT SIZE=2>April&nbsp;28,&nbsp;2006</FONT></TD>
</TR>
<TR VALIGN="TOP">
<TD WIDTH="32%" ALIGN="CENTER"><FONT SIZE=2><BR>
/s/&nbsp;&nbsp;</FONT><FONT SIZE=2>THADDEUS G. WEED</FONT><FONT SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</FONT><HR NOSHADE><FONT SIZE=2> Thaddeus G. Weed</FONT></TD>
<TD WIDTH="3%"><FONT SIZE=2><BR>&nbsp;</FONT></TD>
<TD WIDTH="44%" ALIGN="CENTER"><FONT SIZE=2><BR>
Chief Financial Officer<BR>
(Principal&nbsp;Financial&nbsp;and&nbsp;Accounting&nbsp;Officer)</FONT></TD>
<TD WIDTH="3%"><FONT SIZE=2><BR>&nbsp;</FONT></TD>
<TD WIDTH="19%" ALIGN="RIGHT"><FONT SIZE=2><BR>
April&nbsp;28,&nbsp;2006</FONT></TD>
</TR>
</TABLE>

<!-- end of user-specified TAGGED TABLE -->

<P ALIGN="CENTER"><FONT SIZE=2>II-14</FONT></P>

<HR NOSHADE>
<P style='page-break-before:always'></p>
<!-- ZEQ.=4,SEQ=39,EFW="2169787",CP="COGENT COMMUNICATIONS GROUP, INC",DN="1",CHK=254431,FOLIO='II-14',FILE='DISK124:[06WDC9.06WDC1129]JG1129A.;12',USER='YLEE',CD=';2-MAY-2006;14:13' -->
<A NAME="page_jg1129_1_15"> </A>
<P ALIGN="CENTER"><FONT SIZE=2><B>SIGNATURES  </B></FONT></P>

<P>


<FONT SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Pursuant to the requirements of the Securities Act of 1933, the Registrant has duly caused this Registration Statement to be signed on its behalf by the
undersigned, thereunto duly authorized, in the District of Columbia on April&nbsp;28, 2006.

 </FONT>

</P>

<!-- User-specified TAGGED TABLE -->
<TABLE WIDTH="100%" BORDER=0 CELLSPACING=0 CELLPADDING=0>
<TR VALIGN="TOP">
<TD WIDTH="39%"><FONT SIZE=2><BR>
&nbsp;</FONT></TD>
<TD COLSPAN=3><FONT SIZE=2><BR>
COGENT COMMUNICATIONS OF MASSACHUSETTS,&nbsp;INC.</FONT></TD>
</TR>
<TR VALIGN="TOP">
<TD WIDTH="39%"><FONT SIZE=2><BR>
&nbsp;</FONT></TD>
<TD WIDTH="4%"><FONT SIZE=2><BR>
By:</FONT></TD>
<TD COLSPAN=2><FONT SIZE=2><BR>
/s/&nbsp;&nbsp;</FONT><FONT SIZE=2>DAVID SCHAEFFER</FONT><FONT SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</FONT><HR NOSHADE></TD>
</TR>
<TR VALIGN="TOP">
<TD WIDTH="39%"><FONT SIZE=2>&nbsp;</FONT></TD>
<TD WIDTH="4%"><FONT SIZE=2>&nbsp;</FONT></TD>
<TD WIDTH="8%"><FONT SIZE=2>Name:</FONT></TD>
<TD WIDTH="49%"><FONT SIZE=2>David Schaeffer</FONT></TD>
</TR>
<TR VALIGN="TOP">
<TD WIDTH="39%"><FONT SIZE=2>&nbsp;</FONT></TD>
<TD WIDTH="4%"><FONT SIZE=2>&nbsp;</FONT></TD>
<TD WIDTH="8%"><FONT SIZE=2>Title:</FONT></TD>
<TD WIDTH="49%"><FONT SIZE=2>President, Chief Executive Officer and&nbsp;Director</FONT></TD>
</TR>
</TABLE>
<!-- end of user-specified TAGGED TABLE -->


<P><FONT SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Pursuant
to the requirements of the Securities Act of 1933, this registration statement has been signed by the following persons in the capacities and on the dates indicated. </FONT></P>




<!-- User-specified TAGGED TABLE -->
<TABLE WIDTH="100%" BORDER=0 CELLSPACING=0 CELLPADDING=0>
<TR VALIGN="BOTTOM">
<TH WIDTH="32%" ALIGN="CENTER"><FONT SIZE=1><B>Signature</B></FONT><HR NOSHADE></TH>
<TH WIDTH="3%"><FONT SIZE=1>&nbsp;</FONT></TH>
<TH WIDTH="44%" ALIGN="CENTER"><FONT SIZE=1><B>Title</B></FONT><HR NOSHADE></TH>
<TH WIDTH="3%"><FONT SIZE=1>&nbsp;</FONT></TH>
<TH WIDTH="19%" ALIGN="CENTER"><FONT SIZE=1><B>Date</B></FONT><HR NOSHADE></TH>
</TR>
<TR VALIGN="TOP">
<TD WIDTH="32%" ALIGN="CENTER"><BR><FONT SIZE=2>&nbsp;</FONT></TD>
<TD WIDTH="3%"><FONT SIZE=2><BR>&nbsp;</FONT></TD>
<TD WIDTH="44%"><FONT SIZE=2><BR>
&nbsp;</FONT></TD>
<TD WIDTH="3%"><FONT SIZE=2><BR>&nbsp;</FONT></TD>
<TD WIDTH="19%"><FONT SIZE=2><BR>
&nbsp;</FONT></TD>
</TR>
<TR VALIGN="TOP">
<TD WIDTH="32%" ALIGN="CENTER"><FONT SIZE=2>/s/&nbsp;&nbsp;</FONT><FONT SIZE=2>DAVID SCHAEFFER</FONT><FONT SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</FONT><HR NOSHADE><FONT SIZE=2> David Schaeffer</FONT></TD>
<TD WIDTH="3%"><FONT SIZE=2>&nbsp;</FONT></TD>
<TD WIDTH="44%" ALIGN="CENTER"><FONT SIZE=2>President, Chief Executive Officer and&nbsp;Director<BR>
(Principal Executive Officer)</FONT></TD>
<TD WIDTH="3%"><FONT SIZE=2>&nbsp;</FONT></TD>
<TD WIDTH="19%" ALIGN="RIGHT"><FONT SIZE=2>April&nbsp;28,&nbsp;2006</FONT></TD>
</TR>
<TR VALIGN="TOP">
<TD WIDTH="32%" ALIGN="CENTER"><FONT SIZE=2><BR>
/s/&nbsp;&nbsp;</FONT><FONT SIZE=2>THADDEUS G. WEED</FONT><FONT SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</FONT><HR NOSHADE><FONT SIZE=2> Thaddeus G. Weed</FONT></TD>
<TD WIDTH="3%"><FONT SIZE=2><BR>&nbsp;</FONT></TD>
<TD WIDTH="44%" ALIGN="CENTER"><FONT SIZE=2><BR>
Chief Financial Officer<BR>
(Principal&nbsp;Financial&nbsp;and&nbsp;Accounting&nbsp;Officer)</FONT></TD>
<TD WIDTH="3%"><FONT SIZE=2><BR>&nbsp;</FONT></TD>
<TD WIDTH="19%" ALIGN="RIGHT"><FONT SIZE=2><BR>
April&nbsp;28,&nbsp;2006</FONT></TD>
</TR>
</TABLE>

<!-- end of user-specified TAGGED TABLE -->

<P ALIGN="CENTER"><FONT SIZE=2>II-15</FONT></P>

<HR NOSHADE>
<P style='page-break-before:always'></p>
<!-- ZEQ.=5,SEQ=40,EFW="2169787",CP="COGENT COMMUNICATIONS GROUP, INC",DN="1",CHK=66723,FOLIO='II-15',FILE='DISK124:[06WDC9.06WDC1129]JG1129A.;12',USER='YLEE',CD=';2-MAY-2006;14:13' -->
<!-- THIS IS THE END OF A COMPOSITION COMPONENT -->
<P ALIGN="CENTER"><FONT SIZE=2><A
NAME="page_ji1129_1_16"> </A> </FONT> <FONT SIZE=2><B>SIGNATURES  </B></FONT></P>

<P>


<FONT SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Pursuant to the requirements of the Securities Act of 1933, the Registrant has duly caused this Registration Statement to be signed on its behalf by the
undersigned, thereunto duly authorized, in the District of Columbia on April&nbsp;28, 2006.

 </FONT>

</P>

<!-- User-specified TAGGED TABLE -->
<TABLE WIDTH="100%" BORDER=0 CELLSPACING=0 CELLPADDING=0>
<TR VALIGN="TOP">
<TD WIDTH="42%"><FONT SIZE=2><BR>
&nbsp;</FONT></TD>
<TD COLSPAN=3><FONT SIZE=2><BR>
COGENT COMMUNICATIONS OF MARYLAND,&nbsp;INC.</FONT></TD>
</TR>
<TR VALIGN="TOP">
<TD WIDTH="42%"><FONT SIZE=2><BR>
&nbsp;</FONT></TD>
<TD WIDTH="4%"><FONT SIZE=2><BR>
By:</FONT></TD>
<TD COLSPAN=2><FONT SIZE=2><BR>
/s/&nbsp;&nbsp;</FONT><FONT SIZE=2>DAVID SCHAEFFER</FONT><FONT SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</FONT><HR NOSHADE></TD>
</TR>
<TR VALIGN="TOP">
<TD WIDTH="42%"><FONT SIZE=2>&nbsp;</FONT></TD>
<TD WIDTH="4%"><FONT SIZE=2>&nbsp;</FONT></TD>
<TD WIDTH="8%"><FONT SIZE=2>Name:</FONT></TD>
<TD WIDTH="46%"><FONT SIZE=2>David Schaeffer</FONT></TD>
</TR>
<TR VALIGN="TOP">
<TD WIDTH="42%"><FONT SIZE=2>&nbsp;</FONT></TD>
<TD WIDTH="4%"><FONT SIZE=2>&nbsp;</FONT></TD>
<TD WIDTH="8%"><FONT SIZE=2>Title:</FONT></TD>
<TD WIDTH="46%"><FONT SIZE=2>President, Chief Executive Officer and&nbsp;Director</FONT></TD>
</TR>
</TABLE>
<!-- end of user-specified TAGGED TABLE -->


<P><FONT SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Pursuant
to the requirements of the Securities Act of 1933, this registration statement has been signed by the following persons in the capacities and on the dates indicated. </FONT></P>




<!-- User-specified TAGGED TABLE -->
<TABLE WIDTH="100%" BORDER=0 CELLSPACING=0 CELLPADDING=0>
<TR VALIGN="BOTTOM">
<TH WIDTH="32%" ALIGN="CENTER"><FONT SIZE=1><B>Signature</B></FONT><HR NOSHADE></TH>
<TH WIDTH="3%"><FONT SIZE=1>&nbsp;</FONT></TH>
<TH WIDTH="44%" ALIGN="CENTER"><FONT SIZE=1><B>Title</B></FONT><HR NOSHADE></TH>
<TH WIDTH="3%"><FONT SIZE=1>&nbsp;</FONT></TH>
<TH WIDTH="19%" ALIGN="CENTER"><FONT SIZE=1><B>Date</B></FONT><HR NOSHADE></TH>
</TR>
<TR VALIGN="TOP">
<TD WIDTH="32%" ALIGN="CENTER"><BR><FONT SIZE=2>&nbsp;</FONT></TD>
<TD WIDTH="3%"><FONT SIZE=2><BR>&nbsp;</FONT></TD>
<TD WIDTH="44%"><FONT SIZE=2><BR>
&nbsp;</FONT></TD>
<TD WIDTH="3%"><FONT SIZE=2><BR>&nbsp;</FONT></TD>
<TD WIDTH="19%"><FONT SIZE=2><BR>
&nbsp;</FONT></TD>
</TR>
<TR VALIGN="TOP">
<TD WIDTH="32%" ALIGN="CENTER"><FONT SIZE=2>/s/&nbsp;&nbsp;</FONT><FONT SIZE=2>DAVID SCHAEFFER</FONT><FONT SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</FONT><HR NOSHADE><FONT SIZE=2> David Schaeffer</FONT></TD>
<TD WIDTH="3%"><FONT SIZE=2>&nbsp;</FONT></TD>
<TD WIDTH="44%" ALIGN="CENTER"><FONT SIZE=2>President, Chief Executive Officer and&nbsp;Director<BR>
(Principal Executive Officer)</FONT></TD>
<TD WIDTH="3%"><FONT SIZE=2>&nbsp;</FONT></TD>
<TD WIDTH="19%" ALIGN="RIGHT"><FONT SIZE=2>April&nbsp;28,&nbsp;2006</FONT></TD>
</TR>
<TR VALIGN="TOP">
<TD WIDTH="32%" ALIGN="CENTER"><FONT SIZE=2><BR>
/s/&nbsp;&nbsp;</FONT><FONT SIZE=2>THADDEUS G. WEED</FONT><FONT SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</FONT><HR NOSHADE><FONT SIZE=2> Thaddeus G. Weed</FONT></TD>
<TD WIDTH="3%"><FONT SIZE=2><BR>&nbsp;</FONT></TD>
<TD WIDTH="44%" ALIGN="CENTER"><FONT SIZE=2><BR>
Chief Financial Officer<BR>
(Principal&nbsp;Financial&nbsp;and&nbsp;Accounting&nbsp;Officer)</FONT></TD>
<TD WIDTH="3%"><FONT SIZE=2><BR>&nbsp;</FONT></TD>
<TD WIDTH="19%" ALIGN="RIGHT"><FONT SIZE=2><BR>
April&nbsp;28,&nbsp;2006</FONT></TD>
</TR>
</TABLE>

<!-- end of user-specified TAGGED TABLE -->

<P ALIGN="CENTER"><FONT SIZE=2>II-16</FONT></P>

<HR NOSHADE>
<P style='page-break-before:always'></p>
<!-- ZEQ.=1,SEQ=41,EFW="2169787",CP="COGENT COMMUNICATIONS GROUP, INC",DN="1",CHK=192971,FOLIO='II-16',FILE='DISK124:[06WDC9.06WDC1129]JI1129A.;11',USER='YLEE',CD=';2-MAY-2006;14:13' -->
<A NAME="page_ji1129_1_17"> </A>
<P ALIGN="CENTER"><FONT SIZE=2><B>SIGNATURES  </B></FONT></P>

<P>


<FONT SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Pursuant to the requirements of the Securities Act of 1933, the Registrant has duly caused this Registration Statement to be signed on its behalf by the
undersigned, thereunto duly authorized, in the District of Columbia on April&nbsp;28, 2006.

 </FONT>

</P>

<!-- User-specified TAGGED TABLE -->
<TABLE WIDTH="100%" BORDER=0 CELLSPACING=0 CELLPADDING=0>
<TR VALIGN="TOP">
<TD WIDTH="44%"><FONT SIZE=2><BR>
&nbsp;</FONT></TD>
<TD COLSPAN=3><FONT SIZE=2><BR>
COGENT COMMUNICATIONS OF MISSOURI,&nbsp;INC.</FONT></TD>
</TR>
<TR VALIGN="TOP">
<TD WIDTH="44%"><FONT SIZE=2><BR>
&nbsp;</FONT></TD>
<TD WIDTH="4%"><FONT SIZE=2><BR>
By:</FONT></TD>
<TD COLSPAN=2><FONT SIZE=2><BR>
/s/&nbsp;&nbsp;</FONT><FONT SIZE=2>DAVID SCHAEFFER</FONT><FONT SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</FONT><HR NOSHADE></TD>
</TR>
<TR VALIGN="TOP">
<TD WIDTH="44%"><FONT SIZE=2>&nbsp;</FONT></TD>
<TD WIDTH="4%"><FONT SIZE=2>&nbsp;</FONT></TD>
<TD WIDTH="8%"><FONT SIZE=2>Name:</FONT></TD>
<TD WIDTH="44%"><FONT SIZE=2>David Schaeffer</FONT></TD>
</TR>
<TR VALIGN="TOP">
<TD WIDTH="44%"><FONT SIZE=2>&nbsp;</FONT></TD>
<TD WIDTH="4%"><FONT SIZE=2>&nbsp;</FONT></TD>
<TD WIDTH="8%"><FONT SIZE=2>Title:</FONT></TD>
<TD WIDTH="44%"><FONT SIZE=2>President, Chief Executive Officer and&nbsp;Director</FONT></TD>
</TR>
</TABLE>
<!-- end of user-specified TAGGED TABLE -->


<P><FONT SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Pursuant
to the requirements of the Securities Act of 1933, this registration statement has been signed by the following persons in the capacities and on the dates indicated. </FONT></P>




<!-- User-specified TAGGED TABLE -->
<TABLE WIDTH="100%" BORDER=0 CELLSPACING=0 CELLPADDING=0>
<TR VALIGN="BOTTOM">
<TH WIDTH="32%" ALIGN="CENTER"><FONT SIZE=1><B>Signature</B></FONT><HR NOSHADE></TH>
<TH WIDTH="3%"><FONT SIZE=1>&nbsp;</FONT></TH>
<TH WIDTH="44%" ALIGN="CENTER"><FONT SIZE=1><B>Title</B></FONT><HR NOSHADE></TH>
<TH WIDTH="3%"><FONT SIZE=1>&nbsp;</FONT></TH>
<TH WIDTH="19%" ALIGN="CENTER"><FONT SIZE=1><B>Date</B></FONT><HR NOSHADE></TH>
</TR>
<TR VALIGN="TOP">
<TD WIDTH="32%" ALIGN="CENTER"><BR><FONT SIZE=2>&nbsp;</FONT></TD>
<TD WIDTH="3%"><FONT SIZE=2><BR>&nbsp;</FONT></TD>
<TD WIDTH="44%"><FONT SIZE=2><BR>
&nbsp;</FONT></TD>
<TD WIDTH="3%"><FONT SIZE=2><BR>&nbsp;</FONT></TD>
<TD WIDTH="19%"><FONT SIZE=2><BR>
&nbsp;</FONT></TD>
</TR>
<TR VALIGN="TOP">
<TD WIDTH="32%" ALIGN="CENTER"><FONT SIZE=2>/s/&nbsp;&nbsp;</FONT><FONT SIZE=2>DAVID SCHAEFFER</FONT><FONT SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</FONT><HR NOSHADE><FONT SIZE=2> David Schaeffer</FONT></TD>
<TD WIDTH="3%"><FONT SIZE=2>&nbsp;</FONT></TD>
<TD WIDTH="44%" ALIGN="CENTER"><FONT SIZE=2>President, Chief Executive Officer and&nbsp;Director<BR>
(Principal Executive Officer)</FONT></TD>
<TD WIDTH="3%"><FONT SIZE=2>&nbsp;</FONT></TD>
<TD WIDTH="19%" ALIGN="RIGHT"><FONT SIZE=2>April&nbsp;28,&nbsp;2006</FONT></TD>
</TR>
<TR VALIGN="TOP">
<TD WIDTH="32%" ALIGN="CENTER"><FONT SIZE=2><BR>
/s/&nbsp;&nbsp;</FONT><FONT SIZE=2>THADDEUS G. WEED</FONT><FONT SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</FONT><HR NOSHADE><FONT SIZE=2> Thaddeus G. Weed</FONT></TD>
<TD WIDTH="3%"><FONT SIZE=2><BR>&nbsp;</FONT></TD>
<TD WIDTH="44%" ALIGN="CENTER"><FONT SIZE=2><BR>
Chief Financial Officer<BR>
(Principal&nbsp;Financial&nbsp;and&nbsp;Accounting&nbsp;Officer)</FONT></TD>
<TD WIDTH="3%"><FONT SIZE=2><BR>&nbsp;</FONT></TD>
<TD WIDTH="19%" ALIGN="RIGHT"><FONT SIZE=2><BR>
April&nbsp;28,&nbsp;2006</FONT></TD>
</TR>
</TABLE>

<!-- end of user-specified TAGGED TABLE -->

<P ALIGN="CENTER"><FONT SIZE=2>II-17</FONT></P>

<HR NOSHADE>
<P style='page-break-before:always'></p>
<!-- ZEQ.=2,SEQ=42,EFW="2169787",CP="COGENT COMMUNICATIONS GROUP, INC",DN="1",CHK=843691,FOLIO='II-17',FILE='DISK124:[06WDC9.06WDC1129]JI1129A.;11',USER='YLEE',CD=';2-MAY-2006;14:13' -->
<A NAME="page_ji1129_1_18"> </A>
<P ALIGN="CENTER"><FONT SIZE=2><B>SIGNATURES  </B></FONT></P>

<P>


<FONT SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Pursuant to the requirements of the Securities Act of 1933, the Registrant has duly caused this Registration Statement to be signed on its behalf by the
undersigned, thereunto duly authorized, in the District of Columbia on April&nbsp;28, 2006.

 </FONT>

</P>

<!-- User-specified TAGGED TABLE -->
<TABLE WIDTH="100%" BORDER=0 CELLSPACING=0 CELLPADDING=0>
<TR VALIGN="TOP">
<TD WIDTH="44%"><FONT SIZE=2><BR>
&nbsp;</FONT></TD>
<TD COLSPAN=3><FONT SIZE=2><BR>
COGENT COMMUNICATIONS OF NEW YORK,&nbsp;INC.</FONT></TD>
</TR>
<TR VALIGN="TOP">
<TD WIDTH="44%"><FONT SIZE=2><BR>
&nbsp;</FONT></TD>
<TD WIDTH="4%"><FONT SIZE=2><BR>
By:</FONT></TD>
<TD COLSPAN=2><FONT SIZE=2><BR>
/s/&nbsp;&nbsp;</FONT><FONT SIZE=2>DAVID SCHAEFFER</FONT><FONT SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</FONT><HR NOSHADE></TD>
</TR>
<TR VALIGN="TOP">
<TD WIDTH="44%"><FONT SIZE=2>&nbsp;</FONT></TD>
<TD WIDTH="4%"><FONT SIZE=2>&nbsp;</FONT></TD>
<TD WIDTH="8%"><FONT SIZE=2>Name:</FONT></TD>
<TD WIDTH="44%"><FONT SIZE=2>David Schaeffer</FONT></TD>
</TR>
<TR VALIGN="TOP">
<TD WIDTH="44%"><FONT SIZE=2>&nbsp;</FONT></TD>
<TD WIDTH="4%"><FONT SIZE=2>&nbsp;</FONT></TD>
<TD WIDTH="8%"><FONT SIZE=2>Title:</FONT></TD>
<TD WIDTH="44%"><FONT SIZE=2>President, Chief Executive Officer and&nbsp;Director</FONT></TD>
</TR>
</TABLE>
<!-- end of user-specified TAGGED TABLE -->


<P><FONT SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Pursuant
to the requirements of the Securities Act of 1933, this registration statement has been signed by the following persons in the capacities and on the dates indicated. </FONT></P>




<!-- User-specified TAGGED TABLE -->
<TABLE WIDTH="100%" BORDER=0 CELLSPACING=0 CELLPADDING=0>
<TR VALIGN="BOTTOM">
<TH WIDTH="32%" ALIGN="CENTER"><FONT SIZE=1><B>Signature</B></FONT><HR NOSHADE></TH>
<TH WIDTH="3%"><FONT SIZE=1>&nbsp;</FONT></TH>
<TH WIDTH="44%" ALIGN="CENTER"><FONT SIZE=1><B>Title</B></FONT><HR NOSHADE></TH>
<TH WIDTH="3%"><FONT SIZE=1>&nbsp;</FONT></TH>
<TH WIDTH="19%" ALIGN="CENTER"><FONT SIZE=1><B>Date</B></FONT><HR NOSHADE></TH>
</TR>
<TR VALIGN="TOP">
<TD WIDTH="32%" ALIGN="CENTER"><BR><FONT SIZE=2>&nbsp;</FONT></TD>
<TD WIDTH="3%"><FONT SIZE=2><BR>&nbsp;</FONT></TD>
<TD WIDTH="44%"><FONT SIZE=2><BR>
&nbsp;</FONT></TD>
<TD WIDTH="3%"><FONT SIZE=2><BR>&nbsp;</FONT></TD>
<TD WIDTH="19%"><FONT SIZE=2><BR>
&nbsp;</FONT></TD>
</TR>
<TR VALIGN="TOP">
<TD WIDTH="32%" ALIGN="CENTER"><FONT SIZE=2>/s/&nbsp;&nbsp;</FONT><FONT SIZE=2>DAVID SCHAEFFER</FONT><FONT SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</FONT><HR NOSHADE><FONT SIZE=2> David Schaeffer</FONT></TD>
<TD WIDTH="3%"><FONT SIZE=2>&nbsp;</FONT></TD>
<TD WIDTH="44%" ALIGN="CENTER"><FONT SIZE=2>President, Chief Executive Officer and&nbsp;Director<BR>
(Principal Executive Officer)</FONT></TD>
<TD WIDTH="3%"><FONT SIZE=2>&nbsp;</FONT></TD>
<TD WIDTH="19%" ALIGN="RIGHT"><FONT SIZE=2>April&nbsp;28,&nbsp;2006</FONT></TD>
</TR>
<TR VALIGN="TOP">
<TD WIDTH="32%" ALIGN="CENTER"><FONT SIZE=2><BR>
/s/&nbsp;&nbsp;</FONT><FONT SIZE=2>THADDEUS G. WEED</FONT><FONT SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</FONT><HR NOSHADE><FONT SIZE=2> Thaddeus G. Weed</FONT></TD>
<TD WIDTH="3%"><FONT SIZE=2><BR>&nbsp;</FONT></TD>
<TD WIDTH="44%" ALIGN="CENTER"><FONT SIZE=2><BR>
Chief Financial Officer<BR>
(Principal&nbsp;Financial&nbsp;and&nbsp;Accounting&nbsp;Officer)</FONT></TD>
<TD WIDTH="3%"><FONT SIZE=2><BR>&nbsp;</FONT></TD>
<TD WIDTH="19%" ALIGN="RIGHT"><FONT SIZE=2><BR>
April&nbsp;28,&nbsp;2006</FONT></TD>
</TR>
</TABLE>

<!-- end of user-specified TAGGED TABLE -->

<P ALIGN="CENTER"><FONT SIZE=2>II-18</FONT></P>

<HR NOSHADE>
<P style='page-break-before:always'></p>
<!-- ZEQ.=3,SEQ=43,EFW="2169787",CP="COGENT COMMUNICATIONS GROUP, INC",DN="1",CHK=867426,FOLIO='II-18',FILE='DISK124:[06WDC9.06WDC1129]JI1129A.;11',USER='YLEE',CD=';2-MAY-2006;14:13' -->
<A NAME="page_ji1129_1_19"> </A>
<P ALIGN="CENTER"><FONT SIZE=2><B>SIGNATURES  </B></FONT></P>

<P>


<FONT SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Pursuant to the requirements of the Securities Act of 1933, the Registrant has duly caused this Registration Statement to be signed on its behalf by the
undersigned, thereunto duly authorized, in the District of Columbia on April&nbsp;28, 2006.

 </FONT>

</P>

<!-- User-specified TAGGED TABLE -->
<TABLE WIDTH="100%" BORDER=0 CELLSPACING=0 CELLPADDING=0>
<TR VALIGN="TOP">
<TD WIDTH="44%"><FONT SIZE=2><BR>
&nbsp;</FONT></TD>
<TD COLSPAN=3><FONT SIZE=2><BR>
COGENT COMMUNICATIONS OF OHIO,&nbsp;INC.</FONT></TD>
</TR>
<TR VALIGN="TOP">
<TD WIDTH="44%"><FONT SIZE=2><BR>
&nbsp;</FONT></TD>
<TD WIDTH="4%"><FONT SIZE=2><BR>
By:</FONT></TD>
<TD COLSPAN=2><FONT SIZE=2><BR>
/s/&nbsp;&nbsp;</FONT><FONT SIZE=2>DAVID SCHAEFFER</FONT><FONT SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</FONT><HR NOSHADE></TD>
</TR>
<TR VALIGN="TOP">
<TD WIDTH="44%"><FONT SIZE=2>&nbsp;</FONT></TD>
<TD WIDTH="4%"><FONT SIZE=2>&nbsp;</FONT></TD>
<TD WIDTH="8%"><FONT SIZE=2>Name:</FONT></TD>
<TD WIDTH="44%"><FONT SIZE=2>David Schaeffer</FONT></TD>
</TR>
<TR VALIGN="TOP">
<TD WIDTH="44%"><FONT SIZE=2>&nbsp;</FONT></TD>
<TD WIDTH="4%"><FONT SIZE=2>&nbsp;</FONT></TD>
<TD WIDTH="8%"><FONT SIZE=2>Title:</FONT></TD>
<TD WIDTH="44%"><FONT SIZE=2>President, Chief Executive Officer and&nbsp;Director</FONT></TD>
</TR>
</TABLE>
<!-- end of user-specified TAGGED TABLE -->


<P><FONT SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Pursuant
to the requirements of the Securities Act of 1933, this registration statement has been signed by the following persons in the capacities and on the dates indicated. </FONT></P>




<!-- User-specified TAGGED TABLE -->
<TABLE WIDTH="100%" BORDER=0 CELLSPACING=0 CELLPADDING=0>
<TR VALIGN="BOTTOM">
<TH WIDTH="32%" ALIGN="CENTER"><FONT SIZE=1><B>Signature</B></FONT><HR NOSHADE></TH>
<TH WIDTH="3%"><FONT SIZE=1>&nbsp;</FONT></TH>
<TH WIDTH="44%" ALIGN="CENTER"><FONT SIZE=1><B>Title</B></FONT><HR NOSHADE></TH>
<TH WIDTH="3%"><FONT SIZE=1>&nbsp;</FONT></TH>
<TH WIDTH="19%" ALIGN="CENTER"><FONT SIZE=1><B>Date</B></FONT><HR NOSHADE></TH>
</TR>
<TR VALIGN="TOP">
<TD WIDTH="32%" ALIGN="CENTER"><BR><FONT SIZE=2>&nbsp;</FONT></TD>
<TD WIDTH="3%"><FONT SIZE=2><BR>&nbsp;</FONT></TD>
<TD WIDTH="44%"><FONT SIZE=2><BR>
&nbsp;</FONT></TD>
<TD WIDTH="3%"><FONT SIZE=2><BR>&nbsp;</FONT></TD>
<TD WIDTH="19%"><FONT SIZE=2><BR>
&nbsp;</FONT></TD>
</TR>
<TR VALIGN="TOP">
<TD WIDTH="32%" ALIGN="CENTER"><FONT SIZE=2>/s/&nbsp;&nbsp;</FONT><FONT SIZE=2>DAVID SCHAEFFER</FONT><FONT SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</FONT><HR NOSHADE><FONT SIZE=2> David Schaeffer</FONT></TD>
<TD WIDTH="3%"><FONT SIZE=2>&nbsp;</FONT></TD>
<TD WIDTH="44%" ALIGN="CENTER"><FONT SIZE=2>President, Chief Executive Officer and&nbsp;Director<BR>
(Principal Executive Officer)</FONT></TD>
<TD WIDTH="3%"><FONT SIZE=2>&nbsp;</FONT></TD>
<TD WIDTH="19%" ALIGN="RIGHT"><FONT SIZE=2>April&nbsp;28,&nbsp;2006</FONT></TD>
</TR>
<TR VALIGN="TOP">
<TD WIDTH="32%" ALIGN="CENTER"><FONT SIZE=2><BR>
/s/&nbsp;&nbsp;</FONT><FONT SIZE=2>THADDEUS G. WEED</FONT><FONT SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</FONT><HR NOSHADE><FONT SIZE=2> Thaddeus G. Weed</FONT></TD>
<TD WIDTH="3%"><FONT SIZE=2><BR>&nbsp;</FONT></TD>
<TD WIDTH="44%" ALIGN="CENTER"><FONT SIZE=2><BR>
Chief Financial Officer<BR>
(Principal&nbsp;Financial&nbsp;and&nbsp;Accounting&nbsp;Officer)</FONT></TD>
<TD WIDTH="3%"><FONT SIZE=2><BR>&nbsp;</FONT></TD>
<TD WIDTH="19%" ALIGN="RIGHT"><FONT SIZE=2><BR>
April&nbsp;28,&nbsp;2006</FONT></TD>
</TR>
</TABLE>

<!-- end of user-specified TAGGED TABLE -->

<P ALIGN="CENTER"><FONT SIZE=2>II-19</FONT></P>

<HR NOSHADE>
<P style='page-break-before:always'></p>
<!-- ZEQ.=4,SEQ=44,EFW="2169787",CP="COGENT COMMUNICATIONS GROUP, INC",DN="1",CHK=320401,FOLIO='II-19',FILE='DISK124:[06WDC9.06WDC1129]JI1129A.;11',USER='YLEE',CD=';2-MAY-2006;14:13' -->
<A NAME="page_ji1129_1_20"> </A>
<P ALIGN="CENTER"><FONT SIZE=2><B>SIGNATURES  </B></FONT></P>

<P>


<FONT SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Pursuant to the requirements of the Securities Act of 1933, the Registrant has duly caused this Registration Statement to be signed on its behalf by the
undersigned, thereunto duly authorized, in the District of Columbia on April&nbsp;28, 2006.

 </FONT>

</P>

<!-- User-specified TAGGED TABLE -->
<TABLE WIDTH="100%" BORDER=0 CELLSPACING=0 CELLPADDING=0>
<TR VALIGN="TOP">
<TD WIDTH="39%"><FONT SIZE=2><BR>
&nbsp;</FONT></TD>
<TD COLSPAN=3><FONT SIZE=2><BR>
COGENT COMMUNICATIONS OF PENNSYLVANIA,&nbsp;INC.</FONT></TD>
</TR>
<TR VALIGN="TOP">
<TD WIDTH="39%"><FONT SIZE=2><BR>
&nbsp;</FONT></TD>
<TD WIDTH="4%"><FONT SIZE=2><BR>
By:</FONT></TD>
<TD COLSPAN=2><FONT SIZE=2><BR>
/s/&nbsp;&nbsp;</FONT><FONT SIZE=2>DAVID SCHAEFFER</FONT><FONT SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</FONT><HR NOSHADE></TD>
</TR>
<TR VALIGN="TOP">
<TD WIDTH="39%"><FONT SIZE=2>&nbsp;</FONT></TD>
<TD WIDTH="4%"><FONT SIZE=2>&nbsp;</FONT></TD>
<TD WIDTH="8%"><FONT SIZE=2>Name:</FONT></TD>
<TD WIDTH="49%"><FONT SIZE=2>David Schaeffer</FONT></TD>
</TR>
<TR VALIGN="TOP">
<TD WIDTH="39%"><FONT SIZE=2>&nbsp;</FONT></TD>
<TD WIDTH="4%"><FONT SIZE=2>&nbsp;</FONT></TD>
<TD WIDTH="8%"><FONT SIZE=2>Title:</FONT></TD>
<TD WIDTH="49%"><FONT SIZE=2>President, Chief Executive Officer and&nbsp;Director</FONT></TD>
</TR>
</TABLE>
<!-- end of user-specified TAGGED TABLE -->


<P><FONT SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Pursuant
to the requirements of the Securities Act of 1933, this registration statement has been signed by the following persons in the capacities and on the dates indicated. </FONT></P>




<!-- User-specified TAGGED TABLE -->
<TABLE WIDTH="100%" BORDER=0 CELLSPACING=0 CELLPADDING=0>
<TR VALIGN="BOTTOM">
<TH WIDTH="32%" ALIGN="CENTER"><FONT SIZE=1><B>Signature</B></FONT><HR NOSHADE></TH>
<TH WIDTH="3%"><FONT SIZE=1>&nbsp;</FONT></TH>
<TH WIDTH="44%" ALIGN="CENTER"><FONT SIZE=1><B>Title</B></FONT><HR NOSHADE></TH>
<TH WIDTH="3%"><FONT SIZE=1>&nbsp;</FONT></TH>
<TH WIDTH="19%" ALIGN="CENTER"><FONT SIZE=1><B>Date</B></FONT><HR NOSHADE></TH>
</TR>
<TR VALIGN="TOP">
<TD WIDTH="32%" ALIGN="CENTER"><BR><FONT SIZE=2>&nbsp;</FONT></TD>
<TD WIDTH="3%"><FONT SIZE=2><BR>&nbsp;</FONT></TD>
<TD WIDTH="44%"><FONT SIZE=2><BR>
&nbsp;</FONT></TD>
<TD WIDTH="3%"><FONT SIZE=2><BR>&nbsp;</FONT></TD>
<TD WIDTH="19%"><FONT SIZE=2><BR>
&nbsp;</FONT></TD>
</TR>
<TR VALIGN="TOP">
<TD WIDTH="32%" ALIGN="CENTER"><FONT SIZE=2>/s/&nbsp;&nbsp;</FONT><FONT SIZE=2>DAVID SCHAEFFER</FONT><FONT SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</FONT><HR NOSHADE><FONT SIZE=2> David Schaeffer</FONT></TD>
<TD WIDTH="3%"><FONT SIZE=2>&nbsp;</FONT></TD>
<TD WIDTH="44%" ALIGN="CENTER"><FONT SIZE=2>President, Chief Executive Officer and&nbsp;Director<BR>
(Principal Executive Officer)</FONT></TD>
<TD WIDTH="3%"><FONT SIZE=2>&nbsp;</FONT></TD>
<TD WIDTH="19%" ALIGN="RIGHT"><FONT SIZE=2>April&nbsp;28,&nbsp;2006</FONT></TD>
</TR>
<TR VALIGN="TOP">
<TD WIDTH="32%" ALIGN="CENTER"><FONT SIZE=2><BR>
/s/&nbsp;&nbsp;</FONT><FONT SIZE=2>THADDEUS G. WEED</FONT><FONT SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</FONT><HR NOSHADE><FONT SIZE=2> Thaddeus G. Weed</FONT></TD>
<TD WIDTH="3%"><FONT SIZE=2><BR>&nbsp;</FONT></TD>
<TD WIDTH="44%" ALIGN="CENTER"><FONT SIZE=2><BR>
Chief Financial Officer<BR>
(Principal&nbsp;Financial&nbsp;and&nbsp;Accounting&nbsp;Officer)</FONT></TD>
<TD WIDTH="3%"><FONT SIZE=2><BR>&nbsp;</FONT></TD>
<TD WIDTH="19%" ALIGN="RIGHT"><FONT SIZE=2><BR>
April&nbsp;28,&nbsp;2006</FONT></TD>
</TR>
</TABLE>

<!-- end of user-specified TAGGED TABLE -->

<P ALIGN="CENTER"><FONT SIZE=2>II-20</FONT></P>

<HR NOSHADE>
<P style='page-break-before:always'></p>
<!-- ZEQ.=5,SEQ=45,EFW="2169787",CP="COGENT COMMUNICATIONS GROUP, INC",DN="1",CHK=87925,FOLIO='II-20',FILE='DISK124:[06WDC9.06WDC1129]JI1129A.;11',USER='YLEE',CD=';2-MAY-2006;14:13' -->
<!-- THIS IS THE END OF A COMPOSITION COMPONENT -->
<P ALIGN="CENTER"><FONT SIZE=2><A
NAME="page_jk1129_1_21"> </A> </FONT> <FONT SIZE=2><B>SIGNATURES  </B></FONT></P>

<P>


<FONT SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Pursuant to the requirements of the Securities Act of 1933, the Registrant has duly caused this Registration Statement to be signed on its behalf by the
undersigned, thereunto duly authorized, in the District of Columbia on April&nbsp;28, 2006.

 </FONT>

</P>

<!-- User-specified TAGGED TABLE -->
<TABLE WIDTH="100%" BORDER=0 CELLSPACING=0 CELLPADDING=0>
<TR VALIGN="TOP">
<TD WIDTH="44%"><FONT SIZE=2><BR>
&nbsp;</FONT></TD>
<TD COLSPAN=3><FONT SIZE=2><BR>
COGENT COMMUNICATIONS OF TEXAS,&nbsp;INC.</FONT></TD>
</TR>
<TR VALIGN="TOP">
<TD WIDTH="44%"><FONT SIZE=2><BR>
&nbsp;</FONT></TD>
<TD WIDTH="4%"><FONT SIZE=2><BR>
By:</FONT></TD>
<TD COLSPAN=2><FONT SIZE=2><BR>
/s/&nbsp;&nbsp;</FONT><FONT SIZE=2>DAVID SCHAEFFER</FONT><FONT SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</FONT><HR NOSHADE></TD>
</TR>
<TR VALIGN="TOP">
<TD WIDTH="44%"><FONT SIZE=2>&nbsp;</FONT></TD>
<TD WIDTH="4%"><FONT SIZE=2>&nbsp;</FONT></TD>
<TD WIDTH="8%"><FONT SIZE=2>Name:</FONT></TD>
<TD WIDTH="44%"><FONT SIZE=2>David Schaeffer</FONT></TD>
</TR>
<TR VALIGN="TOP">
<TD WIDTH="44%"><FONT SIZE=2>&nbsp;</FONT></TD>
<TD WIDTH="4%"><FONT SIZE=2>&nbsp;</FONT></TD>
<TD WIDTH="8%"><FONT SIZE=2>Title:</FONT></TD>
<TD WIDTH="44%"><FONT SIZE=2>President, Chief Executive Officer and&nbsp;Director</FONT></TD>
</TR>
</TABLE>
<!-- end of user-specified TAGGED TABLE -->


<P><FONT SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Pursuant
to the requirements of the Securities Act of 1933, this registration statement has been signed by the following persons in the capacities and on the dates indicated. </FONT></P>




<!-- User-specified TAGGED TABLE -->
<TABLE WIDTH="100%" BORDER=0 CELLSPACING=0 CELLPADDING=0>
<TR VALIGN="BOTTOM">
<TH WIDTH="32%" ALIGN="CENTER"><FONT SIZE=1><B>Signature</B></FONT><HR NOSHADE></TH>
<TH WIDTH="3%"><FONT SIZE=1>&nbsp;</FONT></TH>
<TH WIDTH="44%" ALIGN="CENTER"><FONT SIZE=1><B>Title</B></FONT><HR NOSHADE></TH>
<TH WIDTH="3%"><FONT SIZE=1>&nbsp;</FONT></TH>
<TH WIDTH="19%" ALIGN="CENTER"><FONT SIZE=1><B>Date</B></FONT><HR NOSHADE></TH>
</TR>
<TR VALIGN="TOP">
<TD WIDTH="32%" ALIGN="CENTER"><BR><FONT SIZE=2>&nbsp;</FONT></TD>
<TD WIDTH="3%"><FONT SIZE=2><BR>&nbsp;</FONT></TD>
<TD WIDTH="44%"><FONT SIZE=2><BR>
&nbsp;</FONT></TD>
<TD WIDTH="3%"><FONT SIZE=2><BR>&nbsp;</FONT></TD>
<TD WIDTH="19%"><FONT SIZE=2><BR>
&nbsp;</FONT></TD>
</TR>
<TR VALIGN="TOP">
<TD WIDTH="32%" ALIGN="CENTER"><FONT SIZE=2>/s/&nbsp;&nbsp;</FONT><FONT SIZE=2>DAVID SCHAEFFER</FONT><FONT SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</FONT><HR NOSHADE><FONT SIZE=2> David Schaeffer</FONT></TD>
<TD WIDTH="3%"><FONT SIZE=2>&nbsp;</FONT></TD>
<TD WIDTH="44%" ALIGN="CENTER"><FONT SIZE=2>President, Chief Executive Officer and&nbsp;Director<BR>
(Principal Executive Officer)</FONT></TD>
<TD WIDTH="3%"><FONT SIZE=2>&nbsp;</FONT></TD>
<TD WIDTH="19%" ALIGN="RIGHT"><FONT SIZE=2>April&nbsp;28,&nbsp;2006</FONT></TD>
</TR>
<TR VALIGN="TOP">
<TD WIDTH="32%" ALIGN="CENTER"><FONT SIZE=2><BR>
/s/&nbsp;&nbsp;</FONT><FONT SIZE=2>THADDEUS G. WEED</FONT><FONT SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</FONT><HR NOSHADE><FONT SIZE=2> Thaddeus G. Weed</FONT></TD>
<TD WIDTH="3%"><FONT SIZE=2><BR>&nbsp;</FONT></TD>
<TD WIDTH="44%" ALIGN="CENTER"><FONT SIZE=2><BR>
Chief Financial Officer<BR>
(Principal&nbsp;Financial&nbsp;and&nbsp;Accounting&nbsp;Officer)</FONT></TD>
<TD WIDTH="3%"><FONT SIZE=2><BR>&nbsp;</FONT></TD>
<TD WIDTH="19%" ALIGN="RIGHT"><FONT SIZE=2><BR>
April 28,&nbsp;2006</FONT></TD>
</TR>
</TABLE>

<!-- end of user-specified TAGGED TABLE -->

<P ALIGN="CENTER"><FONT SIZE=2>II-21</FONT></P>

<HR NOSHADE>
<P style='page-break-before:always'></p>
<!-- ZEQ.=1,SEQ=46,EFW="2169787",CP="COGENT COMMUNICATIONS GROUP, INC",DN="1",CHK=284127,FOLIO='II-21',FILE='DISK124:[06WDC9.06WDC1129]JK1129A.;10',USER='YLEE',CD=';2-MAY-2006;14:13' -->
<A NAME="page_jk1129_1_22"> </A>
<P ALIGN="CENTER"><FONT SIZE=2><B>SIGNATURES  </B></FONT></P>

<P>


<FONT SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Pursuant to the requirements of the Securities Act of 1933, the Registrant has duly caused this Registration Statement to be signed on its behalf by the
undersigned, thereunto duly authorized, in the District of Columbia on April&nbsp;28, 2006.

 </FONT>

</P>

<!-- User-specified TAGGED TABLE -->
<TABLE WIDTH="100%" BORDER=0 CELLSPACING=0 CELLPADDING=0>
<TR VALIGN="TOP">
<TD WIDTH="44%"><FONT SIZE=2><BR>
&nbsp;</FONT></TD>
<TD COLSPAN=3><FONT SIZE=2><BR>
COGENT COMMUNICATIONS OF VIRGINIA,&nbsp;INC.</FONT></TD>
</TR>
<TR VALIGN="TOP">
<TD WIDTH="44%"><FONT SIZE=2><BR>
&nbsp;</FONT></TD>
<TD WIDTH="4%"><FONT SIZE=2><BR>
By:</FONT></TD>
<TD COLSPAN=2><FONT SIZE=2><BR>
/s/&nbsp;&nbsp;</FONT><FONT SIZE=2>DAVID SCHAEFFER</FONT><FONT SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</FONT><HR NOSHADE></TD>
</TR>
<TR VALIGN="TOP">
<TD WIDTH="44%"><FONT SIZE=2>&nbsp;</FONT></TD>
<TD WIDTH="4%"><FONT SIZE=2>&nbsp;</FONT></TD>
<TD WIDTH="8%"><FONT SIZE=2>Name:</FONT></TD>
<TD WIDTH="44%"><FONT SIZE=2>David Schaeffer</FONT></TD>
</TR>
<TR VALIGN="TOP">
<TD WIDTH="44%"><FONT SIZE=2>&nbsp;</FONT></TD>
<TD WIDTH="4%"><FONT SIZE=2>&nbsp;</FONT></TD>
<TD WIDTH="8%"><FONT SIZE=2>Title:</FONT></TD>
<TD WIDTH="44%"><FONT SIZE=2>President, Chief Executive Officer and&nbsp;Director</FONT></TD>
</TR>
</TABLE>
<!-- end of user-specified TAGGED TABLE -->


<P><FONT SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Pursuant
to the requirements of the Securities Act of 1933, this registration statement has been signed by the following persons in the capacities and on the dates indicated. </FONT></P>




<!-- User-specified TAGGED TABLE -->
<TABLE WIDTH="100%" BORDER=0 CELLSPACING=0 CELLPADDING=0>
<TR VALIGN="BOTTOM">
<TH WIDTH="32%" ALIGN="CENTER"><FONT SIZE=1><B>Signature</B></FONT><HR NOSHADE></TH>
<TH WIDTH="3%"><FONT SIZE=1>&nbsp;</FONT></TH>
<TH WIDTH="44%" ALIGN="CENTER"><FONT SIZE=1><B>Title</B></FONT><HR NOSHADE></TH>
<TH WIDTH="3%"><FONT SIZE=1>&nbsp;</FONT></TH>
<TH WIDTH="19%" ALIGN="CENTER"><FONT SIZE=1><B>Date</B></FONT><HR NOSHADE></TH>
</TR>
<TR VALIGN="TOP">
<TD WIDTH="32%" ALIGN="CENTER"><BR><FONT SIZE=2>&nbsp;</FONT></TD>
<TD WIDTH="3%"><FONT SIZE=2><BR>&nbsp;</FONT></TD>
<TD WIDTH="44%"><FONT SIZE=2><BR>
&nbsp;</FONT></TD>
<TD WIDTH="3%"><FONT SIZE=2><BR>&nbsp;</FONT></TD>
<TD WIDTH="19%"><FONT SIZE=2><BR>
&nbsp;</FONT></TD>
</TR>
<TR VALIGN="TOP">
<TD WIDTH="32%" ALIGN="CENTER"><FONT SIZE=2>/s/&nbsp;&nbsp;</FONT><FONT SIZE=2>DAVID SCHAEFFER</FONT><FONT SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</FONT><HR NOSHADE><FONT SIZE=2> David Schaeffer</FONT></TD>
<TD WIDTH="3%"><FONT SIZE=2>&nbsp;</FONT></TD>
<TD WIDTH="44%" ALIGN="CENTER"><FONT SIZE=2>President, Chief Executive Officer and&nbsp;Director<BR>
(Principal Executive Officer)</FONT></TD>
<TD WIDTH="3%"><FONT SIZE=2>&nbsp;</FONT></TD>
<TD WIDTH="19%" ALIGN="RIGHT"><FONT SIZE=2>April&nbsp;28,&nbsp;2006</FONT></TD>
</TR>
<TR VALIGN="TOP">
<TD WIDTH="32%" ALIGN="CENTER"><FONT SIZE=2><BR>
/s/&nbsp;&nbsp;</FONT><FONT SIZE=2>THADDEUS G. WEED</FONT><FONT SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</FONT><HR NOSHADE><FONT SIZE=2> Thaddeus G. Weed</FONT></TD>
<TD WIDTH="3%"><FONT SIZE=2><BR>&nbsp;</FONT></TD>
<TD WIDTH="44%" ALIGN="CENTER"><FONT SIZE=2><BR>
Chief Financial Officer<BR>
(Principal&nbsp;Financial&nbsp;and&nbsp;Accounting&nbsp;Officer)</FONT></TD>
<TD WIDTH="3%"><FONT SIZE=2><BR>&nbsp;</FONT></TD>
<TD WIDTH="19%" ALIGN="RIGHT"><FONT SIZE=2><BR>
April&nbsp;28,&nbsp;2006</FONT></TD>
</TR>
</TABLE>

<!-- end of user-specified TAGGED TABLE -->

<P ALIGN="CENTER"><FONT SIZE=2>II-22</FONT></P>

<HR NOSHADE>
<P style='page-break-before:always'></p>
<!-- ZEQ.=2,SEQ=47,EFW="2169787",CP="COGENT COMMUNICATIONS GROUP, INC",DN="1",CHK=93800,FOLIO='II-22',FILE='DISK124:[06WDC9.06WDC1129]JK1129A.;10',USER='YLEE',CD=';2-MAY-2006;14:13' -->
<A NAME="page_jk1129_1_23"> </A>
<P ALIGN="CENTER"><FONT SIZE=2><B>SIGNATURES  </B></FONT></P>

<P>


<FONT SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Pursuant to the requirements of the Securities Act of 1933, the Registrant has duly caused this Registration Statement to be signed on its behalf by the
undersigned, thereunto duly authorized, in the District of Columbia on April&nbsp;28, 2006.

 </FONT>

</P>

<!-- User-specified TAGGED TABLE -->
<TABLE WIDTH="100%" BORDER=0 CELLSPACING=0 CELLPADDING=0>
<TR VALIGN="TOP">
<TD WIDTH="44%"><FONT SIZE=2><BR>
&nbsp;</FONT></TD>
<TD COLSPAN=3><FONT SIZE=2><BR>
ALLIED RISER OPERATIONS CORPORATION,&nbsp;INC.</FONT></TD>
</TR>
<TR VALIGN="TOP">
<TD WIDTH="44%"><FONT SIZE=2><BR>
&nbsp;</FONT></TD>
<TD WIDTH="4%"><FONT SIZE=2><BR>
By:</FONT></TD>
<TD COLSPAN=2><FONT SIZE=2><BR>
/s/&nbsp;&nbsp;</FONT><FONT SIZE=2>DAVID SCHAEFFER</FONT><FONT SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</FONT><HR NOSHADE></TD>
</TR>
<TR VALIGN="TOP">
<TD WIDTH="44%"><FONT SIZE=2>&nbsp;</FONT></TD>
<TD WIDTH="4%"><FONT SIZE=2>&nbsp;</FONT></TD>
<TD WIDTH="8%"><FONT SIZE=2>Name:</FONT></TD>
<TD WIDTH="44%"><FONT SIZE=2>David Schaeffer</FONT></TD>
</TR>
<TR VALIGN="TOP">
<TD WIDTH="44%"><FONT SIZE=2>&nbsp;</FONT></TD>
<TD WIDTH="4%"><FONT SIZE=2>&nbsp;</FONT></TD>
<TD WIDTH="8%"><FONT SIZE=2>Title:</FONT></TD>
<TD WIDTH="44%"><FONT SIZE=2>President, Chief Executive Officer and&nbsp;Director</FONT></TD>
</TR>
</TABLE>
<!-- end of user-specified TAGGED TABLE -->


<P><FONT SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Pursuant
to the requirements of the Securities Act of 1933, this registration statement has been signed by the following persons in the capacities and on the dates indicated. </FONT></P>




<!-- User-specified TAGGED TABLE -->
<TABLE WIDTH="100%" BORDER=0 CELLSPACING=0 CELLPADDING=0>
<TR VALIGN="BOTTOM">
<TH WIDTH="32%" ALIGN="CENTER"><FONT SIZE=1><B>Signature</B></FONT><HR NOSHADE></TH>
<TH WIDTH="3%"><FONT SIZE=1>&nbsp;</FONT></TH>
<TH WIDTH="44%" ALIGN="CENTER"><FONT SIZE=1><B>Title</B></FONT><HR NOSHADE></TH>
<TH WIDTH="3%"><FONT SIZE=1>&nbsp;</FONT></TH>
<TH WIDTH="19%" ALIGN="CENTER"><FONT SIZE=1><B>Date</B></FONT><HR NOSHADE></TH>
</TR>
<TR VALIGN="TOP">
<TD WIDTH="32%" ALIGN="CENTER"><BR><FONT SIZE=2>&nbsp;</FONT></TD>
<TD WIDTH="3%"><FONT SIZE=2><BR>&nbsp;</FONT></TD>
<TD WIDTH="44%"><FONT SIZE=2><BR>
&nbsp;</FONT></TD>
<TD WIDTH="3%"><FONT SIZE=2><BR>&nbsp;</FONT></TD>
<TD WIDTH="19%"><FONT SIZE=2><BR>
&nbsp;</FONT></TD>
</TR>
<TR VALIGN="TOP">
<TD WIDTH="32%" ALIGN="CENTER"><FONT SIZE=2>/s/&nbsp;&nbsp;</FONT><FONT SIZE=2>DAVID SCHAEFFER</FONT><FONT SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</FONT><HR NOSHADE><FONT SIZE=2> David Schaeffer</FONT></TD>
<TD WIDTH="3%"><FONT SIZE=2>&nbsp;</FONT></TD>
<TD WIDTH="44%" ALIGN="CENTER"><FONT SIZE=2>President, Chief Executive Officer and&nbsp;Director<BR>
(Principal Executive Officer)</FONT></TD>
<TD WIDTH="3%"><FONT SIZE=2>&nbsp;</FONT></TD>
<TD WIDTH="19%" ALIGN="RIGHT"><FONT SIZE=2>April&nbsp;28,&nbsp;2006</FONT></TD>
</TR>
<TR VALIGN="TOP">
<TD WIDTH="32%" ALIGN="CENTER"><FONT SIZE=2><BR>
/s/&nbsp;&nbsp;</FONT><FONT SIZE=2>THADDEUS G. WEED</FONT><FONT SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</FONT><HR NOSHADE><FONT SIZE=2> Thaddeus G. Weed</FONT></TD>
<TD WIDTH="3%"><FONT SIZE=2><BR>&nbsp;</FONT></TD>
<TD WIDTH="44%" ALIGN="CENTER"><FONT SIZE=2><BR>
Chief Financial Officer<BR>
(Principal&nbsp;Financial&nbsp;and&nbsp;Accounting&nbsp;Officer)</FONT></TD>
<TD WIDTH="3%"><FONT SIZE=2><BR>&nbsp;</FONT></TD>
<TD WIDTH="19%" ALIGN="RIGHT"><FONT SIZE=2><BR>
April&nbsp;28,&nbsp;2006</FONT></TD>
</TR>
</TABLE>

<!-- end of user-specified TAGGED TABLE -->

<P ALIGN="CENTER"><FONT SIZE=2>II-23</FONT></P>

<HR NOSHADE>
<P style='page-break-before:always'></p>
<!-- ZEQ.=3,SEQ=48,EFW="2169787",CP="COGENT COMMUNICATIONS GROUP, INC",DN="1",CHK=242254,FOLIO='II-23',FILE='DISK124:[06WDC9.06WDC1129]JK1129A.;10',USER='YLEE',CD=';2-MAY-2006;14:13' -->
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<!-- TOC_END -->
<P ALIGN="CENTER"><FONT SIZE=2><A
NAME="ka1129_exhibit_index"> </A>
<A NAME="toc_ka1129_1"> </A>
<BR></FONT><FONT SIZE=2><B>EXHIBIT INDEX    <BR>    </B></FONT></P>




<!-- User-specified TAGGED TABLE -->
<TABLE WIDTH="100%" BORDER=0 CELLSPACING=0 CELLPADDING=0>
<TR VALIGN="TOP">
<TD WIDTH="9%"><FONT SIZE=2>&nbsp;&nbsp;3.1</FONT></TD>
<TD WIDTH="3%"><FONT SIZE=2>&nbsp;</FONT></TD>
<TD WIDTH="88%"><FONT SIZE=2>Fifth Amended and Restated Certificate of Incorporation (incorporated by reference to Exhibit 3.1 of our Annual Report on Form 10-K for the year ended December 31, 2004, filed on March 31, 2005).</FONT></TD>
</TR>
<TR VALIGN="TOP">
<TD WIDTH="9%"><FONT SIZE=2><BR>
&nbsp;&nbsp;3.2</FONT></TD>
<TD WIDTH="3%"><FONT SIZE=2><BR>&nbsp;</FONT></TD>
<TD WIDTH="88%"><FONT SIZE=2><BR>
Amended Bylaws of Cogent Communications Group, Inc. (incorporated by reference to Exhibit 3.2 of our Quarterly Report on Form 10-Q for the quarter ended March 31, 2005, filed on May 6, 2005).</FONT></TD>
</TR>
<TR VALIGN="TOP">
<TD WIDTH="9%"><FONT SIZE=2><BR>
&nbsp;&nbsp;4.1(1)</FONT></TD>
<TD WIDTH="3%"><FONT SIZE=2><BR>&nbsp;</FONT></TD>
<TD WIDTH="88%"><FONT SIZE=2><BR>
Specimen Preferred Stock Certificate.</FONT></TD>
</TR>
<TR VALIGN="TOP">
<TD WIDTH="9%"><FONT SIZE=2><BR>
&nbsp;&nbsp;4.2(1)</FONT></TD>
<TD WIDTH="3%"><FONT SIZE=2><BR>&nbsp;</FONT></TD>
<TD WIDTH="88%"><FONT SIZE=2><BR>
Form of Debt Security.</FONT></TD>
</TR>
<TR VALIGN="TOP">
<TD WIDTH="9%"><FONT SIZE=2><BR>
&nbsp;&nbsp;4.3</FONT></TD>
<TD WIDTH="3%"><FONT SIZE=2><BR>*</FONT></TD>
<TD WIDTH="88%"><FONT SIZE=2><BR>
Form of Indenture, between Cogent Communications Group, Inc. and one or more trustees to be named.</FONT></TD>
</TR>
<TR VALIGN="TOP">
<TD WIDTH="9%"><FONT SIZE=2><BR>
&nbsp;&nbsp;4.4(1)</FONT></TD>
<TD WIDTH="3%"><FONT SIZE=2><BR>&nbsp;</FONT></TD>
<TD WIDTH="88%"><FONT SIZE=2><BR>
Form of Warrant.</FONT></TD>
</TR>
<TR VALIGN="TOP">
<TD WIDTH="9%"><FONT SIZE=2><BR>
&nbsp;&nbsp;5.1</FONT></TD>
<TD WIDTH="3%"><FONT SIZE=2><BR>*</FONT></TD>
<TD WIDTH="88%"><FONT SIZE=2><BR>
Form of Opinion of Latham &amp; Watkins LLP.</FONT></TD>
</TR>
<TR VALIGN="TOP">
<TD WIDTH="9%"><FONT SIZE=2><BR>
12.1</FONT></TD>
<TD WIDTH="3%"><FONT SIZE=2><BR>*</FONT></TD>
<TD WIDTH="88%"><FONT SIZE=2><BR>
Statement of Computation of Ratios</FONT></TD>
</TR>
<TR VALIGN="TOP">
<TD WIDTH="9%"><FONT SIZE=2><BR>
23.1</FONT></TD>
<TD WIDTH="3%"><FONT SIZE=2><BR>&nbsp;</FONT></TD>
<TD WIDTH="88%"><FONT SIZE=2><BR>
Consent of Ernst &amp; Young LLP, independent registered public accounting firm.</FONT></TD>
</TR>
<TR VALIGN="TOP">
<TD WIDTH="9%"><FONT SIZE=2><BR>
23.2</FONT></TD>
<TD WIDTH="3%"><FONT SIZE=2><BR>&nbsp;</FONT></TD>
<TD WIDTH="88%"><FONT SIZE=2><BR>
Consent of Latham &amp; Watkins LLP (included in Exhibit 5.1).</FONT></TD>
</TR>
<TR VALIGN="TOP">
<TD WIDTH="9%"><FONT SIZE=2><BR>
24.1</FONT></TD>
<TD WIDTH="3%"><FONT SIZE=2><BR>*</FONT></TD>
<TD WIDTH="88%"><FONT SIZE=2><BR>
Power of Attorney.</FONT></TD>
</TR>
<TR VALIGN="TOP">
<TD WIDTH="9%"><FONT SIZE=2><BR>
25.1(1)</FONT></TD>
<TD WIDTH="3%"><FONT SIZE=2><BR>&nbsp;</FONT></TD>
<TD WIDTH="88%"><FONT SIZE=2><BR>
Statement of Eligibility of Trustee on Form T-1.</FONT></TD>
</TR>
</TABLE>

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<HR NOSHADE ALIGN="LEFT" WIDTH="120">

<DL compact>

<DT style='margin-bottom:-11pt;'><FONT SIZE=2>*</FONT></DT><DD><FONT SIZE=2>Previously
filed.

<BR><BR></FONT></DD>

<DT style='margin-bottom:-11pt;'><FONT SIZE=2>(1)</FONT></DT><DD><FONT SIZE=2>To
be filed by amendment or by a report filed under the Securities Exchange Act of 1934, as amended, and incorporated herein by reference. </FONT></DD></DL>
<HR NOSHADE>
<P style='page-break-before:always'></p>
<!-- ZEQ.=1,SEQ=49,EFW="2169787",CP="COGENT COMMUNICATIONS GROUP, INC",DN="1",CHK=124101,FOLIO='blank',FILE='DISK124:[06WDC9.06WDC1129]KA1129A.;5',USER='JENGLIS',CD=';1-MAY-2006;14:24' -->
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<BR>
<P><br><A NAME="06WDC1129_1">QuickLinks</A><br></P><!-- TOC_BEGIN -->
<FONT SIZE=2><A HREF="#toc_bg1129_1">TABLE OF CONTENTS</A></FONT><BR>
<FONT SIZE=2><A HREF="#toc_bg1129_2">ABOUT THIS PROSPECTUS</A></FONT><BR>
<!-- TOC_BEGIN -->
<FONT SIZE=2><A HREF="#toc_dc1129_1">ABOUT COGENT</A></FONT><BR>
<FONT SIZE=2><A HREF="#toc_dc1129_2">RISK FACTORS</A></FONT><BR>
<FONT SIZE=2><A HREF="#toc_dc1129_3">FORWARD-LOOKING STATEMENTS</A></FONT><BR>
<FONT SIZE=2><A HREF="#toc_dc1129_4">RATIO OF EARNINGS TO FIXED CHARGES</A></FONT><BR>
<FONT SIZE=2><A HREF="#toc_dc1129_5">USE OF PROCEEDS</A></FONT><BR>
<FONT SIZE=2><A HREF="#toc_dc1129_6">SELLING STOCKHOLDERS</A></FONT><BR>
<FONT SIZE=2><A HREF="#toc_dc1129_7">PLAN OF DISTRIBUTION</A></FONT><BR>
<!-- TOC_BEGIN -->
<FONT SIZE=2><A HREF="#toc_de1129_1">DESCRIPTION OF DEBT SECURITIES</A></FONT><BR>
<!-- TOC_BEGIN -->
<FONT SIZE=2><A HREF="#toc_dg1129_1">DESCRIPTION OF COMMON STOCK</A></FONT><BR>
<FONT SIZE=2><A HREF="#toc_dg1129_2">DESCRIPTION OF PREFERRED STOCK</A></FONT><BR>
<!-- TOC_BEGIN -->
<FONT SIZE=2><A HREF="#toc_di1129_1">DESCRIPTION OF WARRANTS</A></FONT><BR>
<FONT SIZE=2><A HREF="#toc_di1129_2">CERTAIN PROVISIONS OF DELAWARE LAW AND OF THE COMPANY'S CHARTER AND BYLAWS</A></FONT><BR>
<FONT SIZE=2><A HREF="#toc_di1129_3">LEGAL MATTERS</A></FONT><BR>
<FONT SIZE=2><A HREF="#toc_di1129_4">EXPERTS</A></FONT><BR>
<FONT SIZE=2><A HREF="#toc_di1129_5">WHERE YOU CAN FIND MORE INFORMATION</A></FONT><BR>
<!-- TOC_BEGIN -->
<FONT SIZE=2><A HREF="#toc_ja1129_1">PART II INFORMATION NOT REQUIRED IN THE PROSPECTUS</A></FONT><BR>
<UL>
<FONT SIZE=2><A HREF="#toc_ja1129_2">Item 14. Other Expenses of Issuance and Distribution.</A></FONT><BR>
<FONT SIZE=2><A HREF="#toc_ja1129_3">Item 15. Indemnification of Directors and Officers.</A></FONT><BR>
<FONT SIZE=2><A HREF="#toc_ja1129_4">Item 16. Exhibits</A></FONT><BR>
<FONT SIZE=2><A HREF="#toc_ja1129_5">Item 17. Undertakings</A></FONT><BR>
</UL>
<!-- TOC_BEGIN -->
<FONT SIZE=2><A HREF="#toc_jc1129_1">SIGNATURES</A></FONT><BR>
<!-- TOC_BEGIN -->
<FONT SIZE=2><A HREF="#toc_ka1129_1">EXHIBIT INDEX</A></FONT><BR>
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</TEXT>
</DOCUMENT>
<DOCUMENT>
<TYPE>EX-23.1
<SEQUENCE>2
<FILENAME>a2169787zex-23_1.htm
<DESCRIPTION>EXHIBIT 23.1
<TEXT>
<HTML>
<HEAD>
</HEAD>
<BODY BGCOLOR="#FFFFFF" LINK=BLUE  VLINK=PURPLE>
<BR>
<FONT SIZE=3 ><A HREF="#06WDC1129_2">QuickLinks</A></FONT>
<font size=3> -- Click here to rapidly navigate through this document</font>
<!-- TOC_END -->
<P ALIGN="RIGHT"><FONT SIZE=2><B>Exhibit 23.1  </B></FONT></P>

<P ALIGN="CENTER"><FONT SIZE=2><A
NAME="lo1130_consent_of_independent___lo102333"> </A>
<A NAME="toc_lo1130_1"> </A>
<BR></FONT><FONT SIZE=2><B>Consent of Independent Registered Public Accounting Firm    <BR>    </B></FONT></P>

<P><FONT SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;We consent to the reference to our firm under the caption "Experts" in Amendment No.&nbsp;1 to the Registration Statement (Form&nbsp;S-3
No.&nbsp;333-133200) and related Prospectus of Cogent Communications Group,&nbsp;Inc. for the registration of debt securities, shares of its common stock, shares of preferred stock,
and warrants for the purchase of debt securities, common stock or preferred stock and to the incorporation by reference therein of our reports dated March&nbsp;13, 2006, with respect to the
consolidated financial statements and schedule of Cogent Communications Group,&nbsp;Inc., Cogent Communications Group,&nbsp;Inc. management's assessment of the effectiveness of internal control
over financial reporting, and the effectiveness of internal control over financial reporting of Cogent Communications Group,&nbsp;Inc., included in its Annual Report (Form&nbsp;10-K)
for the year ended December&nbsp;31, 2005, filed with the Securities and Exchange Commission. </FONT></P>

<P ALIGN="RIGHT"><FONT SIZE=2>/s/
Ernst&nbsp;&amp; Young LLP </FONT></P>

<P><FONT SIZE=2>McLean,
VA<BR>
May&nbsp;1, 2006 </FONT></P>

<HR NOSHADE>
<P style='page-break-before:always'></p>
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<BR>
<P><br><A NAME="06WDC1129_2">QuickLinks</A><br></P><!-- TOC_BEGIN -->
<FONT SIZE=2><A HREF="#toc_lo1130_1">Consent of Independent Registered Public Accounting Firm</A></FONT><BR>
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