Exhibit 21.1 CABLE DESIGN TECHNOLOGIES CORPORATION SUBSIDIARIES OF THE REGISTRANT Anglo-American Cables Limited (Incorporated - United Kingdom) A.W. Industries (Incorporated - Florida) Barcel/CDT, Inc. (Incorporated - California) Cable Design Technologies Inc. (Incorporated - State of Washington) CDT (Deutschland) GMBH (Incorporated - Germany) CDT International Holdings Inc. (Incorporated - Delaware) CDT Italia, S.R.L. (Incorporated - Italy) Industria Tecnica Cavi S.R.L. (Incorporated - Italy, 85% ownership) Cekan/CDT A/S (Incorporated - Denmark) Dearborn/CDT, Inc. (Incorporated - Delaware) Hamilton USA, Inc. (d/b/a BoseLAN/CDT) (Incorporated - California) HEW-Kabel/CDT GmbH & Co. KG (German Partnership, 80% ownership) HEW-Kabel/CDT Verwaltungs GMBH (Incorporated - Germany, 80% ownership) HEW Skandinaviska AB (Incorporated - Sweden, 80% ownership) NEK Kabel AB (Incorporated - Sweden) Network Essentials, Inc. (d/b/a Red Hawk/CDT) (Incorporated - Delaware) NORDX/CDT Australia Pty Limited (Incorporated - Australia) NORDX/CDT Asia Limited (Incorporated - Hong Kong) NORDX/CDT, Corp. (Incorporated - Delaware) NORDX/CDT do Brasil Ltda (Incorporated - Brazil) NORDX/CDT, Limited (Incorporated - United Kingdom) NORDX/CDT, Inc. (Incorporated - Canada) NORDX/CDT - IP Corp. (Incorporated - Delaware) NorLAN/CDT, Inc. (Incorporated - Canada) Noslo Limited (Incorporated - United Kingdom) Orebro Kabel AB (Incorporated - Sweden) Raydex/CDT Limited (Incorporated - United Kingdom) SKL, S.A.S. (Incorporated - France, joint venture) Stronglink/CDT Pty. Ltd. (Incorporated - Australia, 76% ownership) Tennecast Company (Incorporated - Ohio) Thermax/CDT, Inc. (Incorporated - Delaware) Wire Group International, Limited (Incorporated - United Kingdom) X-Mark/CDT Inc. (Incorporated - Pennsylvania)