EX-21.1 3 ccoi-20251231xex21d1.htm EX-21.1

EXHIBIT 21.1

In Effect as of February 1, 2026

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Legal Entity | Jurisdiction
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COGENT COMMUNICATIONS HOLDINGS, INC. | Delaware
subsidiaries: | ​
COGENT COMMUNICATIONS GROUP, LLC | Delaware
COGENT COMMUNICATIONS, LLC | Delaware
COGENT FINANCE, INC. | Delaware
COGENT COMMUNICATIONS OF CALIFORNIA, INC. | Delaware
COGENT COMMUNICATIONS OF D.C., INC. | Delaware
COGENT COMMUNICATIONS OF FLORIDA, INC. | Delaware
COGENT COMMUNICATIONS OF MARYLAND, INC. | Delaware
COGENT COMMUNICATIONS OF TEXAS USA, INC. | Delaware
COGENT IH, LLC | Delaware
COGENT WG, LLC | Delaware
COGENT TW, LLC | Delaware
COGENT RB, LLC | Delaware
COGENT AFRICAONE, LLC | Delaware
COGENT AFRICATWO, LLC | Delaware
COGENT INFRASTRUCTURE, LLC | Delaware
COGENT IPV4 HOLDCO LLC | Delaware
COGENT IPV4 LLC | Delaware
WIRELINE NETWORK HOLDINGS LLC | Delaware
UTELCOM LLC | Kansas
SPRINT INTERNATIONAL HOLDING LLC | Kansas
SPRINT COMMUNICATIONS COMPANY LP | Delaware
SPRINT INTERNATIONAL LLC | Delaware
SPRINT INTERNATIONAL COMMUNICATIONS LLC | Delaware
SPRINT INTERNATIONAL NETWORK COMPANY LLC | Delaware
SPRINT SOLUTIONS WIRELINE LLC | Delaware
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COGENT CANADA, INC. | Nova Scotia, Canada
COGENT EUROPE HOLDINGS, S.À R.L. | Luxembourg
COGENT EUROPE, SARL | Luxembourg
COGENT ALBANIA SH.P.K. | Albania
COGENT ARGENTINA S.R.L. | Argentina
COGENT COMMUNICATIONS AUSTRALIA PTY LTD | Australia
COGENT COMMUNICATIONS BELGIUM SPRL | Belgium
COGENT BRASIL TELECOMUNICAÇÕES LTDA. | Brazil
COGENT COMMUNICATIONS BULGARIA EOOD | Bulgaria
COGENT COMMUNICATIONS CHILE LIMITADA | Chile
COGENT COLOMBIA, S.A.S | Colombia
COGENT COSTA RICA LLC, S. de R.L. | Costa Rica
COGENT INTERNET d.o.o. | Croatia
COGENT COMMUNICATIONS CZECH REPUBLIC S.R.O. | Czech Republic
COGENT COMMUNICATIONS DENMARK ApS | Denmark
COGENT COMMUNICATIONS ESTONIA, OU | Estonia
COGENT COMMUNICATIONS FINLAND OY | Finland
COGENT COMMUNICATIONS France, SAS | France
CCD COGENT COMMUNICATIONS DEUTSCHLAND GmbH | Germany
(with branches in Austria and Sweden) | ​
AUSTRIA Permanent Establishment of C.C.D. Cogent Communications Deutschland, GmbH | Austria
SWEDISH Branch Svensk filial till C.C.D. Communications Deutschland GmbH | Sweden
COGENT HELLAS INTERNET SERVICES SOLE MEMBER LIMITED LIABILITY COMPANY | Greece
COGENT COMMUNICATIONS GUATEMALA Y COMPAÑÍA LIMITADA | Guatemala
COGENT COMMUNICATIONS HONG KONG LIMITED | Hong Kong
COGENT COMMUNICATIONS HUNGARY KFT | Hungary

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COGENT INTERNET PRIVATE LIMITED | India
CCE COGENT INTERNET SERVICES LTD. | Ireland
COGENT COMMUNICATIONS ITALIA SRL | Italy
COGENT JAPAN G.K. | Japan
COGENT COMMUNICATIONS KENYA LIMITED | Kenyan
COGENT LATVIA SIA | Latvia
COGENT LITHUANIA UAB | Lithuania
COMPANY FOR INTERNET SERVICES COGENT MACEDONIA DOOEL SKOPJE | Macedonia
Î.C.S. “COGENT INTERNET MLD” S.R.L. | Moldova
COGENT COMMUNICATIONS MONTENEGRO d.o.o., Podgorica | Montenegro
CCM COMMUNICATIONS, S.de R.L. de C.V. | Mexico
COGENT COMMUNICATIONS NETHERLANDS B.V. | Netherlands
COGENT NEW ZEALAND LIMITED | New Zealand
COGENT NORWAY AS | Norway
COGENT COMMUNICATIONS PANAMA S. de R.L. | Panama
COGENT PERÚ S.R.L. | Peru
COGENT PHILIPPINES COMMUNICATIONS, CORP. | Philippines
COGENT COMMUNICATIONS POLAND Sp.zo.o. | Poland
COGENT COMMUNICATIONS PORTUGAL Lda | Portugal
COGENT COMMUNICATIONS ROMANIA SRL | Romania
COGENT SERB D.O.O. BEOGRAD | Serbia
COGENT INTERNET SINGAPORE PTE. LTD. | Singapore
COGENT COMMUNICATIONS SLOVAKIA S.R.O. | Slovakia
COGENT ADRIA, KOMUNIKACIJE, d.o.o. | Slovenia
COGENT SOUTH AFRICA (PTY) LTD | South Africa
COGENT KOREA YUHAN HOESA (COGENT KOREA, LLC) | South Korea
COGENT COMMUNICATIONS ESPANA S.L. | Spain
COGENT INTERNET SWITZERLAND, LLC | Switzerland
COGENT TAIWAN LIMITED | Taiwan
COGENT COMMUNICATIONS TANZANIA LIMITED | Tanzania
COGENT COMMUNICATIONS (THAILAND) LIMITED | Thailand
COGENT COMMUNICATIONS INTERNET SERVICES LLC | Turkey
COGENT COMMUNICATIONS UK LTD. | United Kingdom
TOV COGENT COMMUNICATIONS UKRAINE | Ukraine
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SPRINT INTERNATIONAL ARGENTINA, S.R.L. | Argentina
SPRINT INTERNATIONAL AUSTRALIA PTY LIMITED | Australia
SPRINT INTERNATIONAL AUSTRIA GMBH | Austria
SPRINT INTERNATIONAL COLOMBIA LTDA | Colombia
SPRINT INTERNATIONAL CZECH REPUBLIC S.R.O. | Czech Republic
SPRINTLINK DENMARK APS | Denmark
SPRINTLINK GERMANY GMBH | Germany
SPRINT TELECOM INDIA PRIVATE LIMITED | India
SIHI MEXICO, S. DE R.L. DE C.V. | Mexico
SPRINTLINK POLAND SP. Z O.O. | Poland
SPRINT RUS LLC | Russia
SPRINT INTERNATIONAL COMMUNICATIONS SINGAPORE PTE LTD | Singapore
SPRINT INTERNATIONAL SPAIN, S.L. | Spain
SIHI SCANDINAVIA AB | Sweden
SPRINT INTERNATIONAL TAIWAN LIMITED | Taiwan
SPRINT (THAILAND) LIMITED | Thailand
SPRINTLINK UK LIMITED | United Kingdom

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