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, Inc.

State of Delaware

ADTRAN International, Inc.

State of Delaware

ADTRAN Networks Worldwide, Inc.

State of Delaware

ADTRAN Networks, LLC

State of Delaware

Bluesocket, Inc.

State of 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 Networks Sdn Bhd

Malaysia

ADTRAN Networks S.A. de C.V.

Mexico

ADTRAN Peru S.R.L.

Peru

ADTRAN Sp. z.o.o.

Poland

ADTRAN s.r.o.

Slovakia

ADTRAN Proprietary Ltd.

South Africa

ADTRAN Switzerland GmbH

Switzerland

ADTRAN SARL

Tunisia

ADTRAN Europe Limited

United Kingdom

ADTRAN Networks and Services Egypt, LLC

Egypt

ADTRAN Networks New Zealand Ltd.

New Zealand

Adtran Technology GmbH

Germany

Adtran Networks North America, Inc.

State of Delaware

Adtran Networks (UK) Limited

United Kingdom

Oscilloquartz SA

Switzerland

Adtran Networks Spólka z o.o.

Poland

Adtran Networks Israel Ltd.

Israel

Adtran Networks (Shenzhen) Ltd.

China

Oscilloquartz Finland Oy

Finland

Adtran Networks Service (Shenzhen) Ltd.

China

Adtran Networks Singapore Pte. Ltd.

Singapore

Adtran Networks Hong Kong Limited

China

Adtran Networks IT Solutions India Private Limited

India

ADVA Optical Networking Serviços Brazil Ltda.

Brazil

Adtran Networks Japan Co., Ltd.

Japan

Adtran Networks AB

Sweden

ADVA NA Holdings Inc.

State of Georgia

Adtran Networks Australia Pty Ltd.

Australia

Adtran Networks B.V.

Netherlands

Adtran Networks Canada, Inc.

Canada

ADVA Network Security GmbH

Germany