Exhibit 21.1

SUBSIDIARIES OF WESCO INTERNATIONAL, INC.

1502218 Alberta Ltd., an Alberta corporation

Atlanta Electrical Distributors, LLC, a Delaware limited liability company

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 GP, 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 Materiales Electricos E-Supply Limitada, a Chile limited liability company

EECOL Electric Bolivia Ltda., a Bolivia limited liability company

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

EECOL Electric Corp, an Alberta corporation

EECOL Industrial Electric Ecuador Limitada, an Ecuador 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

Hazmasters, Inc., an Ontario corporation

Hi-Line Utility Supply Company, LLC, an Illinois limited liability company

Hill Country Electric Supply, L.P., a Texas limited partnership

Liberty Wire & Cable, Inc., a Delaware corporation

Needham Electric Supply, LLC, a Delaware limited liability company

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

Services Voice, Video and Data Distribution de Mexico, S. de R.L. de C.V., a Mexico limited liability company

Stone Eagle Electrical Supply GP Inc., an Alberta corporation

Stone Eagle Electrical Supply Limited Partnership, an Alberta limited partnership

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 UK Holdings Limited, a United Kingdom limited company

Voice, Video and Data Distribution de Mexico, S. de R.L. de C.V., a Mexico limited liability company

WDC Holding Inc., a Delaware corporation

WDCH, LP, a Pennsylvania limited partnership

WDCH US LP, a Delaware limited partnership

WDI-Angola, LDA, an Angola company

WDI USVI, LLC, a Delaware company

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

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, S. de R.L., a Mexico private limited company

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

WESCO Australia Pty Ltd, an Australian company

WESCO Canada I, LP, an Alberta limited partnership

WESCO Canada GP Inc., an Ontario corporation

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

WESCO Distribution Canada LP, an Ontario limited partnership

WESCO Distribution de Mexico, S. de R.L., 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 Limited, a United Kingdom limited company

WESCO Distribution Ireland Limited, an Ireland limited company

WESCO Distribution, Inc., a Delaware corporation

WESCO Distribution IV Inc., an Ontario corporation

WESCO Distribution NL B.V., a Netherlands private company with limited liability

WESCO Distribution Pte. Ltd., a Singapore limited private company

WESCO Enterprises, Inc., a Delaware corporation

WESCO Equity Corporation, a Delaware corporation

WESCO Holdings, LLC, a Delaware limited liability company

WESCO Integrated Supply, Inc., a Delaware corporation

WESCO Integrated Supply Polska Spolka z o.o., a Poland limited company

WESCO Nevada, Ltd., a Nevada corporation

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

WESCO Nigeria, Inc., a Delaware corporation

WESCO Procurement Canada ULC, an Alberta unlimited liability company

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 Services, LLC, a Delaware limited liability company

WESCO TLD Holdings Co., Ltd., a Thailand limited private company

WND Nigeria Limited, a Nigeria corporation