EX-21 3 adtn-ex21.htm EX-21

Exhibit 21

SUBSIDIARIES OF ADTRAN, INC.

December 31, 2021

Name of Subsidiary |  | Country or State of Incorporation
ADTRAN Networks Pty. Ltd |  | Australia
ADTRAN Networks Comunicações Ltda. |  | Brazil
ADTRAN Canada, Inc. |  | Canada
ADTRAN d.o.o. |  | Croatia
ADTRAN International, Inc. |  | Delaware
ADTRAN Networks Worldwide, Inc. |  | Delaware
ADTRAN Networks, LLC |  | Delaware
Bluesocket, Inc. |  | Delaware
ADTRAN Oy |  | Finland
ADTRAN GmbH |  | Germany
ADTRAN Networks M.E.P.E. |  | Greece
ADTRAN Networks India Private Limited |  | India
ADTRAN Holdings Ltd. |  | Israel
ADTRAN S.R.L. |  | Italy
ADTRAN K.K. |  | Japan
ADTRAN Networks Sdn Bhd |  | Malaysia
ADTRAN Networks S.A. de C.V. |  | Mexico
ADTRAN Networks & Services, S. de R.L. de C.V. |  | Mexico
ADTRAN Peru S.R.L. |  | Peru
ADTRAN Sp. z.o.o. |  | Poland
ADTRAN, Unipessoal Lda. |  | Portugal
ADTRAN International, Inc. - Saudi Arabia branch |  | Saudi Arabia
ADTRAN s.r.o. |  | Slovakia
ADTRAN Proprietary Ltd. |  | South Africa
ADTRAN Switzerland GmbH |  | Switzerland
ADTRAN GmbH (Tunisia Permanent Establishment Branch Office) |  | Tunisia
ADTRAN SARL |  | Tunisia
ADTRAN Europe Limited |  | United Kingdom
SmartRG, Inc. |  | Delaware