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Exhibit 21.1

SUBSIDIARIES OF THE COMPANY

STATE OF
LEGAL NAME DOING BUSINESS AS INCORPORATION
---------- ----------------- -------------

Black Box Corporation Black Box Corporation Delaware

ATIMCO Network Services, Inc. Black Box Network Services - Western Pennsylvania Pennsylvania

American Telephone Wiring Company Black Box Network Services - Charleston, West Virginia West Virginia

Midwest Communications Technologies, Inc. Black Box Network Services - Cleveland, Columbus, Ohio
Detroit

Associated Network Solutions, Inc. Black Box Network Services - Central Florida Florida

Advanced Communications Corporation Black Box Network Services - South Carolina South Carolina

Ohmega Installations Limited Black Box Network Services - Newbury (UK)

Cable Consultants, Incorporated Black Box Network Services - Atlanta Georgia

Todd Communications, Inc. Black Box Network Services - North Carolina North Carolina

Comm Line, Inc. Black Box Network Services - Cincinnati Ohio

Koncepts Communications of L.I., Corp. Black Box Network Services - Tri-State New York

Communication Contractors, Inc. Black Box Network Services - Chicago Illinois

U.S. Premise Networking Services, Inc. Black Box Network Services - Minneapolis Minnesota

Datech Holdings Limited Black Box Network Services - Nottingham (UK)

Black Box Network Services, Inc. - Government Black Box Network Services, Inc. - Government Tennessee
Solutions Solutions

R&D Services, Inc. Black Box Network Services - New England Massachusetts

Delaney Telecom, Inc. Black Box Network Services - Philadelphia Cabling Pennsylvania

Delaney Electrical Services, Inc. Black Box Network Services - Philadelphia Electrical Pennsylvania

K&A Communications, Inc. Black Box Network Services - St. Louis Missouri

Jet Line Communications, Inc. Black Box Network Services - Dallas Texas

FBS Communications, LP Black Box Network Services - San Antonio Texas

A.T.S., Inc. Black Box Network Services - Huntington, West Virginia West Virginia

Advanced Network Technologies, Inc. Black Box Network Services - Southern California California

Teldata Corporation Black Box Network Services - Tennessee Commercial Tennessee

ST Communications & Cabling, Inc. Black Box Network Services - Kansas City Missouri

STATE OF
LEGAL NAME DOING BUSINESS AS INCORPORATION
---------- ----------------- -------------

Black Box Network Services & Electrical, Inc. Black Box Network Services & Electrical, Inc. New York
Allcom Electric

Black Box Network Services Baltimore
Black Box Network Services Baltimore, Inc. Black Box Network Services Virginia Delaware
Black Box Network Services D.C.

Datel Communications, Inc. Black Box Network Services - Arizona Arizona

Data Specialties Europe Ltd. (holding company) Black Box Network Services - Cambridge (UK)

Midwest Electronics and Communications, Inc. Black Box Network Services - Denver Colorado

Duracom, Inc. Black Box Network Services - Seattle Washington
Black Box Network Services - Oregon

Black Box Network Services (Cambridge) Ltd. Black Box Network Services (Cambridge) Ltd. (UK)
(UK)

Black Box Network Services Reseavux Black Box Network Services Reseavux Mediterranee SAS
Mediterranee SAS (Montpelier, France) (Montpelier, France)

Black Box Network Services AG (Switzerland) Black Box Network Services AG (Switzerland)

Michael Electric, Inc. Black Box Network Services - New Jersey New Jersey

Integrated Cabling Systems, Inc. Black Box Network Services - Nebraska Nebraska

Black Box Network Services (London) Ltd. (UK) Black Box Network Services (London) Ltd. (UK)

DESIGNet, Inc. Black Box Network Services - San Jose California

Black Box Network Services Puebla S.A. de Black Box Network Services Puebla S.A. de C.V. (Mexico)
C.V. (Mexico)

Black Box Network Services AB (Sweden) Black Box Network Services AB (Sweden)

Optech Fibres Ltd. Black Box Network Services - Northwest (UK)

Black Box Network Services (Northampton) Ltd. Black Box Network Services (Northampton) Ltd. (UK)
(UK)

Black Box Network Services srl - Rome (Italy) Black Box Network Services srl - Rome (Italy)

Lanetwork Sales Ltd. Black Box Network Services - Kitchener (Canada)

Black Box Netzwerkservice Bayern GmbH (Germany) Black Box Netzwerkservice Bayern GmbH (Germany)

Telefuture Communications, Ltd. Black Box Network Services - New Rochelle New York

Black Box Netzwerkservice Stuttgart GmbH Black Box Netzwerkservice Stuttgart GmbH (Germany)
(Germany)

Black Box Network Services Singapore Pte Ltd. Black Box Network Services Singapore Pte Ltd.

Black Box Services Paris SAS Black Box Services Paris SAS

STATE OF
LEGAL NAME DOING BUSINESS AS INCORPORATION
---------- ----------------- -------------

Black Box Network Services (N. Ireland) Ltd. Black Box Network Services (N. Ireland) Ltd.

Black Box Network Services (Dublin) Ltd. Black Box Network Services (Dublin) Ltd.

BBox Holding Company BBox Holding Company Delaware

Black Box Corporation of Pennsylvania Black Box Corporation of Pennsylvania Delaware

Black Box UK, Ltd. Black Box UK, Ltd.

Black Box Canada Corporation Black Box Canada Corporation

Black Box Foreign Sales Corporation Black Box Foreign Sales Corporation

Black Box France, S.A.S. Black Box France, S.A.S.

Black Box Datacom, B.V. (Netherlands) Black Box Datacom, B.V. (Netherlands)

Black Box Network Products NV (Belgium) Black Box Network Products NV (Belgium)

Black Box Network Design NV (Belgium) Black Box Network Design NV (Belgium)

Black Box Network Cabling NV (Belgium) Black Box Network Cabling NV (Belgium)

Blue Box (Netherlands) Blue Box (Netherlands)

BB Technologies, Inc. BB Technologies, Inc. Delaware

Datacom Black Box Services AG (Switzerland) Datacom Black Box Services AG (Switzerland)

Black Box Deutschland GmbH (Germany) Black Box Deutschland GmbH (Germany)

Black Box Italia, srl Black Box Italia, srl

Black Box Network Services Kabushiki Kaisha Black Box Network Services Kabushiki Kaisha (Japan)
(Japan)

Black Box Network Services Australia Black Box Network Services Australia Pty Ltd.
Pty Ltd.

Black Box Network Services New Black Box Network Services New Zealand Limited
Zealand Limited

Black Box do Brazil Industria e Black Box do Brazil Industria e Comercio Ltda.
Comercio Ltda.

Black Box de Mexico, S.A. de C.V. Black Box de Mexico, S.A. de C.V.

Black Box P.R. Corp. (Puerto Rico) Black Box P.R. Corp. (Puerto Rico)

Black Box Chile, S.A. Black Box Chile, S.A.

Black Box Comunicaciones, SAU (Spain) Black Box Comunicaciones, SAU (Spain)

Black Box GmbH (Austria) Black Box GmbH (Austria)

Black Box Norge AS (Norway) Black Box Norge AS (Norway)

Black Box Finland OY Black Box Finland OY

Black Box AB (Sweden) Black Box AB (Sweden)

Black Box A/S (Denmark) Black Box A/S (Denmark)