Exhibit 21.1

Subsidiaries of WESCO International, Inc.

1502218 Alberta, Ltd., an Alberta corporation

Bruckner Polska sp z.o.o., a Poland limited company

Bruckner Supply Singapore, a Singapore sole proprietor

Bruckner Supply Company, Inc., a Delaware corporation

Calvert-Wire & Cable Corporation, a Delaware corporation

Carlton-Bates Company, an Arkansas corporation

Carlton-Bates Company de Mexico S.A. de C.V., a Mexico variable capital company

Carlton-Bates Company of Texas, G.P., Inc., a Texas corporation

CBC LP Holdings, LLC, a Delaware limited liability company

CDW Holdco, LLC, a Delaware limited liability company

Communications Supply Corporation, a Connecticut corporation

Conney Investment Holdings, LLC, a Delaware limited liability company

Conney Safety Products, LLC, a Delaware limited liability company

Distribuidora Materials Electricos E-Supply Limitada, a Chile limited liability company

EECOL Industrial Electric Ecuador Limitada, an Ecuador limited liability company

EECOL Electric Argentina S.A., an Argentine corporation

EECOL Electric Corp., an Alberta corporation

EECOL Electric Peru S.A.C., a Peru sociedad anonima cerrada

EECOL Holdings Ltd., an Alberta corporation

EECOL Industrial Bolivia Ltda., a Bolivia limited liability company

EECOL Industrial Electric (SudAmerica) Limitada, a Chile limited liability company

EECOL Industrial Electric Limitada, a Chile limited liability company

EECOL Power S.A., a Chile closed stock corporation

EECOL Properties Corp., an Alberta corporation

Liberty-Wire & Cable, Inc., a Delaware corporation

M&M Power Products, LP, a California limited partnership

Obras Y Servicios Sunpark S.A.C. (OS Sunpark), a Peru sociedad anonima cerrada

SASK Alta Holdings S.A., a Chile closely held stock corporation

Stone Eagle Electrical Supply GP, Inc., an Alberta corporation

Stone Eagle Electrical Supply LP, an Alberta limited partnership

TVC Canada Corp., a Nova Scotia unlimited liability company

TVC Communications, L.L.C., a Delaware limited liability company

TVC Espana Distribucion y Venta De Equipos, S.L., a Spain limited liability company

TVC International Holding, L.L.C., a Delaware limited liability company

TVC Mexico Distribution S. de R.L. de C.V., a Mexico limited liability company

TVC Mexico Services S. de R.L. de C.V., a Mexico limited liability company

TVC UK Holdings Limited, a United Kingdom limited company

WDC Holding, Inc., a Delaware corporation

WDCC Enterprises, Inc., an Alberta corporation

WDCH, LP, a Pennsylvania limited partnership

WDCH US LP, a Delaware limited partnership

WDINESCO B.V., a Netherlands private company with limited liability

WDINESCO Cooperatief U.A., a Netherlands company

WDINESCO C.V., a Netherlands limited partnership

WDINESCO II B.V., a Netherlands private company with limited liability

WDINESCO III B.V., a Netherlands private company with limited liability

WDINESCO II C.V., a Netherlands limited partnership

WDINESCO III C.V., a Netherlands limited partnership

WEAS Company, Srl, a Mexico private limited company

WESCO (Suzhou) Trading Co. Ltd., a China limited liability company

WDI Angola, LDA, an Angola company

WESCO Australia Pty Ltd, an Australian company

WESCO Canada I, LP, an Alberta limited partnership

WESCO Canada II, LP, an Alberta limited partnership

WESCO Distribution Canada Co., a Nova Scotia unlimited liability company

WESCO Distribution Canada GP, Inc., a Nova Scotia limited liability company

WESCO Distribution Canada LP, an Ontario limited partnership

WESCO Distribution de Mexico, Srl, a Mexico private limited company

WESCO Distribution HK Limited, a Hong Kong limited private company

WESCO Distribution II ULC, a Nova Scotia unlimited liability company

WESCO Distribution III ULC, a Nova Scotia unlimited liability company

WESCO Distribution International, Ltd., a United Kingdom limited company

WESCO Distribution, Inc., a Delaware Corporation

Wesco do Brasil Equipamentos Eletrônicos Ltda, a Brazil limited liability company

WESCO Enterprises, Inc., a Delaware corporation

WESCO Equity Corporation, a Delaware corporation

WESCO Finance Corporation, a Delaware corporation

WESCO Holdings, LLC, a Delaware limited liability company

WESCO International Supply Co. Singapore Pte Ltd., a Singapore limited private company

WESCO Nevada, Ltd, a Nevada corporation

WESCO Nigeria Ltd., a Nigeria corporation

WESCO Nigeria, Inc., a Delaware corporation

WESCO Real Estate I, LLC, a Delaware limited liability company

WESCO Real Estate II, LLC, a Delaware limited liability company

WESCO Real Estate III, LLC, a Delaware limited liability company

WESCO Real Estate IV, LLC, a Delaware limited liability company

WESCO Receivables Corp., a Delaware corporation

WESCO Sourcing and Procurement Services Pte Ltd., a Singapore limited private company