Name of Subsidiary

Country or State of Incorporation

ADTRAN Networks Pty. Ltd

Australia

ADTRAN Networks Comunicações Ltda.

Brazil

ADTRAN Canada, Inc.

Canada

ADTRAN Networks 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 Hong Kong Limited

Hong Kong

ADTRAN International, Inc. – Hong Kong Branch

Hong Kong

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 LLC

Russia

ADTRAN International, Inc. - Saudi Arabia branch

Saudi Arabia

ADTRAN Singapore Pte. Ltd.

Singapore

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