Exhibit 21.1

Significant Subsidiaries of WESCO International, Inc.

CDW Holdco, LLC

WDC Holding, Inc.

WESCO Distribution, Inc.

WESCO Distribution Canada Co.

WESCO Distribution Canada LP

WESCO Equity Corporation

WESCO Finance Corporation

WESCO Receivables Corporation

Carlton-Bates Company

Communications Supply Corporation

Bruckner Supply Company, Inc.