Exhibit 21

ARRIS Group Inc. & Subsidiaries

As of February 27, 2013

ARRIS Group Inc., (Delaware), stock is publicly traded

ARRIS Enterprises I, Inc.

ARRIS Enterprises II, Inc.

ARRIS Solutions, Inc., (Delaware)

C-COR Solutions Pvt. Ltd. (India)—dormant

ARRIS Group Canada, Inc

Worldbridge Broadband Services S. de R.L. e C.V. (Mexico)—dormant

ARRIS Group de Mexico S.A. de C.V. (Mexico)

ARRIS Group Europe Holding B.V. (Netherlands)

ARRIS Group B.V. (Netherlands)

ARRIS Group B.V. France Branch

ARRIS Group B.V. U.K. Branch

ARRIS Germany GmbH (Germany)

ARRIS International Iberica S.L. (Spain)

ARRIS International Iberica S.L. Portugal Branch

C-COR Argentina S.R.L.

BigBand Networks, Inc. (Delaware)

BigBand Deutschland GmbH (Germany)

BigBand Networks (Shenzhen) Co., Ltd. (China)

ARRIS Broadband Solutions, Ltd. (Israel)

ARRIS Solutions PTE, LTD. (Singapore)

Texscan Corporation, (Nevada) —dormant

ANTEC International Corporation (Barbados)— dormant

ARRIS Holding Corp. of Illinois (Illinois)

Power Guard, Inc., (Illinois)—dormant

ARRIS Korea, Inc., (Delaware)

ARRIS Korea, Inc. Korea Branch

ARRIS Group, Inc., Sucursal Argentina (Argentina)—dormant

ARRIS Do Brasil LTDA (Brasil)

Arris Group Japan K.K. (Tokyo, Japan)

ARRIS Group Telecommunicaciones Compania Limited (Chile)

Arris Communications Ireland Limited (Ireland)

ARRIS Technology (Shenzhen) Co., Ltd. (China)

ARRIS Beijing Branch (China)

ARRIS Shanghai Branch (China)