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Exhibit 21.1 SUBSIDIARIES OF THE REGISTRANT State or OtherJurisdiction ofIncorporation orLegal Name
    
    Doing Business As
    
    OrganizationBlack Box Corporation
    
    Black Box Corporation
    
    DelawareBBox Holding Company
    
    BBox Holding Company
    
    DelawareAtimco Network Services, Inc.
    
    Black Box Network Services  Western Pennsylvania
Operations
    
    PennsylvaniaAmerican Telephone Wiring Company
    
    Black Box Network Services  West Virginia Operations
    
    West VirginiaMidwest Communications Technologies, Inc.
    
    Black Box Network Services
    
    OhioAssociated Network Solutions, Inc.
    
    Black Box Network Services
Black Box Network Services  Central Florida
Black Box Network Services  Southeast Florida
    
    FloridaAdvanced Communications Corporation
    
    Black Box Network Services  South Carolina
    
    South CarolinaCable Consultants, Incorporated
    
    Black Box Network Services  Atlanta
    
    GeorgiaTodd Communications, Inc.
    
    Black Box Network Services  North Carolina
    
    North CarolinaComm Line, Inc.
    
    Black Box Network Services
    
    OhioKoncepts Communications of L.I., Corp.
    
    Black Box Network Services  Tristate Operations
    
    New YorkCommunication Contractors, Inc.
    
    Black Box Network Services  Chicago
    
    IllinoisU.S. Premise Networking Services, Inc.
    
    Black Box Network Services  MN
    
    MinnesotaBlack
Box Network Services, Inc.  Government
    Solutions
    
    Black Box Network Services, Inc.  Government Solutions
    
    TennesseeR & D Services, Inc.
    
    Black Box Network Services
Black Box Network Services  New England
    
    MassachusettsDelaney Telecom, Inc.
    
    Black Box Network Services
    
    PennsylvaniaK & A Communications, Inc.
    
    Black Box Network Services
    
    MissouriJet Line Communications, Inc.
    
    Black Box Network Services  Dallas
    
    TexasFBS Communications, L.P.
    
    Black Box Network Services  San Antonio
    
    TexasA.T.S., Inc.
    
    Black Box Network Services  Huntington
    
    West Virginia




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State or OtherJurisdiction ofIncorporation orLegal Name
    
    Doing Business As
    
    OrganizationAdvanced Network Technologies, Inc.
    
    Black Box Network Services  California
    
    CaliforniaTeldata Corporation
    
    Black Box Network Services  Tennessee
    
    TennesseeST Communications & Cabling, Incorporated
    
    Black Box Network Services  Kansas City
Black Box Network Services  Iowa
    
    MissouriBlack Box Network and Electrical Services, Inc.
    
    Black Box Network and Electrical
Services, Inc.
Allcom Electric
    
    New YorkBlack Box Network Services Baltimore, Inc.
    
    Black Box Network Services
Baltimore, Inc.
Black Box Network Services  Virginia
Black Box Network Services  Kensington
    
    DelawareDatel Communications, Inc.
    
    Black Box Network Services  Arizona
    
    ArizonaMidwest Electronics and Communications, Inc.
    
    Black Box Network Services  Denver Operations
    
    ColoradoMichael Electric, Inc.
    
    Black Box Network Services  New Jersey
    
    New JerseyIntegrated Cabling Systems, Inc.
    
    Black Box Network Services  Nebraska
    
    NebraskaDESIGNet, Inc.
    
    Black Box Network Services  San Jose
    
    CaliforniaTelefuture Communications Ltd.
    
    Black Box Network Services  New Rochelle Office
    
    New YorkBlack Box Corporation of Pennsylvania
    
    Black Box Corporation of Pennsylvania
    
    DelawareBlack Box Network ServicesBB Technologies, Inc.
    
    BB Technologies, Inc.
    
    DelawareBlack Box Canada Corporation
    
    Black Box Canada Corporation
    
    CanadaBlack Box Foreign Sales Corporation
    
    Black Box Foreign Sales Corporation
    
    U.S. Virgin IslandsBlack Box France, S.A.S.
    
    Black Box France, S.A.S.
    
    FranceBlack Box Services Reseaux Ile De France SAS
    
    Black Box Services Reseaux Ile De France SAS
    
    FranceBlack Box Datacom B.V.
    
    Black Box Datacom B.V.
    
    NetherlandsBlack Box Network Products NV
    
    Black Box Network Products NV
    
    BelgiumBlack Box Network Design NV
    
    Black Box Network Design NV
    
    BelgiumBlue Box B.V.
    
    Blue Box B.V.
    
    NetherlandsBlack Box Network Cabling NV
    
    Black Box Network Cabling NV
    
    Belgium
 2




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State or OtherJurisdiction ofIncorporation orLegal Name
    
    Doing Business As
    
    OrganizationBlack Box Deutschland GmbH
    
    Black Box Deutschland GmbH
    
    GermanyBlack Box Netzwerk Services Bayern GmbH
    
    Black Box Netzwerk Services Bayern GmbH
    
    GermanyBlack Box Netzwerk Services Stuttgart GmbH
    
    Black Box Netzwerk Services Stuttgart GmbH
    
    GermanyBlack Box Italia S.r.l.
    
    Black Box Italia S.r.l.
    
    ItalyBlack Box Network Services Kabushiki Kaisha
    
    Black Box Network Services Kabushiki Kaisha
    
    JapanBlack Box Network Services Australia Pty Ltd.
    
    Black Box Network Services Australia Pty Ltd.
    
    AustraliaBlack Box Network Services New Zealand Limited
    
    Black Box Network Services New Zealand Limited
    
    New ZealandBlack Box do Brasil Industria e Comercio Ltda.
    
    Black Box do Brasil Industria e Comercio Ltda.
    
    BrazilBlack Box de Mexico, S.A. de C.V.
    
    Black Box de Mexico, S.A. de C.V.
    
    MexicoBlack Box P.R. Corp.
    
    Black Box P.R. Corp.
    
    Puerto RicoBlack Box Chile S.A.
    
    Black Box Chile S.A.
    
    ChileBlack Box comunicaciones SAU
    
    Black Box comunicaciones SAU
    
    SpainBlack Box GmbH
    
    Black Box GmbH
    
    AustriaBlack Box A/S
    
    Black Box A/S
    
    DenmarkBlack Box Network Services AG
    
    Black Box Network Services AG
    
    SwitzerlandBlack Box Holdings Australia Pty. Ltd.
    
    Black Box Holdings Australia Pty. Ltd.
    
    AustraliaBlack Box Network Services (UK) Ltd.
    
    Black Box Network Services (UK) Ltd.
    
    EnglandBlack Box Network
Services Reseaux Mediterranee
  SAS
    
    Black Box Network Services Reseaux Mediterranee SAS
    
    FranceBlack Box Network Services Gouda BV
    
    Black Box Network Services Gouda BV
    
    NetherlandsBlack Box Networkservices Basel AG
    
    Black Box Networkservices Basel AG
    
    SwitzerlandBlack Box Network Services Puebla S.A. de C.V.
    
    Black Box Network Services Puebla S.A. de C.V.
    
    MexicoJC Informatica Integral, S.A. de C.V.
    
    JC Informatica Integral, S.A. de C.V.
    
    MexicoConsultoria en Redes, S.A. de C.V.
    
    Consultoria en Redes, S.A. de C.V.
    
    Mexico
 3




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State or OtherJurisdiction ofIncorporation orLegal Name
    
    Doing Business As
    
    OrganizationBlack Box Network Services AB
    
    Black Box Network Services AB
    
    SwedenBlack Box Network Services s.r.l.
    
    Black Box Network Services s.r.l.
    
    ItalyLanetwork Sales Ltd.
    
    Black Box Network Services  Kitchener Operations
    
    CanadaBlack Box Network Services Singapore Pte Ltd.
    
    Black Box Network Services Singapore Pte Ltd.
    
    SingaporeBlack Box Network Services (Dublin) Ltd.
    
    Black Box Network Services (Dublin) Ltd.
    
    IrelandBlack Box Norge AS
    
    Black Box Norge AS
    
    NorwayBlack Box Finland OY
    
    Black Box Finland OY
    
    FinlandBlack Box AB
    
    Black Box AB
    
    SwedenNorstan, Inc.
    
    Black Box Network Services
    
    MinnesotaNorstan Communications, Inc.
    
    Black Box Network Services
    
    MinnesotaVibes Technologies, Inc.
    
    Black Box Resale Services
    
    MinnesotaNorstan International, Inc.
    
    Norstan International, Inc.
    
    MinnesotaNorstan Canada Inc.
    
    Norstan Canada Inc.
    
    MinnesotaNorstan Canada, Ltd.
    
    Black Box Network Services
    
    CanadaNorstan Financial Services, Inc.
    
    Norstan Financial Services, Inc.
    
    MinnesotaTelecommunication Systems Management, Inc.
    
    Black Box Network Services
    
    VirginiaGTC Technology Group, Inc.
    
    Black Box Network Services
    
    FloridaTechnology Supply, Inc.
    
    Black Box Network Services
    
    FloridaBusiness Communications, Inc.
    
    Black Box Network Services
    
    FloridaBCI of Tampa, LLC
    
    Black Box Network Services
    
    FloridaBainbridge Communications, Inc.
    
    Black Box Network Services
    
    GeorgiaNetworx, L.L.C.
    
    Black Box Network Services
    
    Florida
 4