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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
    
    DelawareBainbridge
Communications, Inc.
    
    Black Box Network
Services
    
    GeorgiaBBox Holding Company
    
    BBox Holding Company
    
    DelawareA.T.S., Inc.
    
    Black Box Network Services  Huntington
    
    West VirginiaAdvanced Communications Corporation
    
    Black Box Network Services  South Carolina
    
    South CarolinaAdvanced Network Technologies, Inc.
    
    Black Box Network Services  California
    
    CaliforniaAmerican Telephone Wiring Company
    
    Black Box Network Services  West Virginia Operations
    
    West VirginiaAssociated Network Solutions, Inc.
    
    Black Box Network Services
    
    FloridaBlack Box Network Services  Southeast FloridaAtimco Network Services, Inc.
    
    Black Box Network Services  Western Pennsylvania
    
    PennsylvaniaOperationsBlack Box Corporation of Pennsylvania
    
    Black Box Corporation of Pennsylvania
    
    DelawareBlack Box Network ServicesBB Technologies, Inc.
    
    BB Technologies, Inc.
    
    DelawareBlack Box A/S
    
    Black Box A/S
    
    DenmarkBlack Box Canada Corporation
    
    Black Box Canada Corporation
    
    CanadaBlack Box Chile S.A.
    
    Black Box Chile S.A.
    
    ChileBlack Box Comunicaciones S.A.
    
    Black Box Comunicaciones S.A.
    
    SpainBlack Box Datacom B.V.
    
    Black Box Datacom B.V.
    
    NetherlandsBlack Box de Mexico, S.A. de C.V.
    
    Black Box de Mexico, S.A. de C.V.
    
    MexicoBlack 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
    
    Germany




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State or OtherJurisdiction ofIncorporation orLegal Name
    
    Doing Business As
    
    OrganizationBlack Box do Brasil Industria e Comercio Ltda.
    
    Black Box do Brasil Industria e Comercio Ltda.
    
    BrazilBlack 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 GmbH
    
    Black Box GmbH
    
    AustriaBlack Box Holdings Australia Pty. Ltd.
    
    Black Box Holdings Australia Pty. Ltd.
    
    AustraliaBlack Box Italia S.r.l.
    
    Black Box Italia S.r.l.
    
    ItalyBlack Box Network Products NV
    
    Black Box Network Products NV
    
    BelgiumBlack Box Network Cabling NV
    
    Black Box Network Cabling NV
    
    BelgiumBlack Box Network Design NV
    
    Black Box Network Design NV
    
    BelgiumBlack Box Network Services AG
    
    Black Box Network Services AG
    
    SwitzerlandBlack 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 Network Services Kabushiki Kaisha
    
    Black Box Network Services Kabushiki Kaisha
    
    JapanBlack Box P.R. Corp.
    
    Black Box P.R. Corp.
    
    Puerto RicoBlack Box Network and Electrical Services, Inc.
    
    Black Box Network and Electrical Services, Inc.
    
    New YorkAllcom ElectricBlack Box Network Services Baltimore, Inc.
    
    Black Box Network Services Baltimore, Inc.
    
    DelawareBlack Box Network Services  VirginiaBlack Box Network Services  KensingtonBlack Box Network Services, Inc.  Government
    
    Black Box Network Services, Inc.  Government
    
    TennesseeSolutions
    
    SolutionsCable Consultants, Incorporated
    
    Black Box Network Services  Atlanta
    
    GeorgiaComm Line, Inc.
    
    Black Box Network Services
    
    Ohio
 2




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State or OtherJurisdiction ofIncorporation orLegal Name
    
    Doing Business As
    
    OrganizationCommunication Contractors, Inc.
    
    Black Box Network Services  Chicago
    
    IllinoisDatel Communications, Inc.
    
    Black Box Network Services  Arizona
    
    ArizonaDelaney Telecom, Inc.
    
    Black Box Network Services
    
    PennsylvaniaDESIGNet, Inc.
    
    Black Box Network Services  San Jose
    
    CaliforniaIntegrated Cabling Systems, Inc.
    
    Black Box Network Services  Nebraska
    
    NebraskaJet Line Communications, Inc.
    
    Black Box Network Services  Dallas
    
    TexasBBC Acquisition, LLC
    
    BBC Acquisition, LLC
    
    TexasFBS Communications, L.P.
    
    Black Box Network Services  San Antonio
    
    TexasK & A Communications, Inc.
    
    Black Box Network Services
    
    MissouriKoncepts Communications of L.I., Corp.
    
    Black Box Network Services  Tristate Operations
    
    New YorkMichael Electric, Inc.
    
    Black Box Network Services  New Jersey
    
    New JerseyMidwest Communications Technologies, Inc.
    
    Black Box Network Services
    
    OhioMidwest Electronics and Communications, Inc.
    
    Black Box Network Services  Denver Operations
    
    ColoradoR & D Services, Inc.
    
    Black Box Network Services
    
    MassachusettsBlack Box Network Services  New EnglandST Communications & Cabling, Incorporated
    
    Black Box Network Services  Kansas City
    
    MissouriBlack Box Network Services  IowaTeldata Corporation
    
    Black Box Network Services  Tennessee
    
    TennesseeTelefuture Communications Ltd.
    
    Black Box Network Services  New Rochelle Office
    
    New YorkTodd Communications, Inc.
    
    Black Box Network Services  North Carolina
    
    North CarolinaU.S. Premise Networking Services, Inc.
    
    Black Box Network Services  MN
    
    MinnesotaBlack Box AB
    
    Black Box AB
    
    Sweden
 3




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State or OtherJurisdiction ofIncorporation orLegal Name
    
    Doing Business As
    
    OrganizationBlack Box Finland OY
    
    Black Box Finland OY
    
    FinlandBlack Box Network Services AB
    
    Black Box Network Services AB
    
    SwedenBlack Box Network Services Corporation
    
    Black Box Network Services Corporation
    
    TaiwanBlack Box Network Services (Dublin) Ltd.
    
    Black Box Network Services (Dublin) Ltd.
    
    IrelandBlack Box Network Services Gouda BV
    
    Black Box Network Services Gouda BV
    
    NetherlandsBlack Box Network Services Puebla S.A. de C.V.
    
    Black Box Network Services Puebla S.A. de C.V.
    
    MexicoBlack
Box Network Services Reseaux Mediterranee SAS
    
    Black Box Network
Services Reseaux Mediterranee SAS
    
    FranceBlack Box Network Services s.r.l.
    
    Black Box Network Services s.r.l.
    
    ItalyBlack Box Network Services Singapore Pte Ltd.
    
    Black Box Network Services Singapore Pte Ltd.
    
    SingaporeBlack Box Network Services (UK) Ltd.
    
    Black Box Network Services (UK) Ltd.
    
    EnglandBlack Box Network Services (UK)
Ltd. Northern IrelandBlack Box Networkservices Basel AG
    
    Black Box Networkservices Basel AG
    
    SwitzerlandBlack Box Norge AS
    
    Black Box Norge AS
    
    NorwayBusiness Communications, Inc.
    
    Black Box Network Services
    
    FloridaBCI of Tampa, LLC
    
    Black Box Network Services
    
    FloridaCommunication is World InterActive Networking, Inc.
    
    Black Box Network Services
    
    GeorgiaConsultoria en Redes, S.A. de C.V.
    
    Consultoria en Redes, S.A. de C.V.
    
    MexicoConverged Solutions Group, LLC
    
    Black Box Network Services
    
    TennesseeGTC Technology Group, Inc.
    
    Black Box Network Services
    
    FloridaJC Informatica Integral, S.A. de C.V.
    
    JC Informatica Integral, S.A. de C.V.
    
    MexicoLanetwork Sales Ltd.
    

Black
Box Network Services  Ajax Operations
    
    CanadaBlack Box Network Services  Kitchener Operations
 4




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State or OtherJurisdiction ofIncorporation orLegal Name
    
    Doing Business As
    
    OrganizationNetworx, L.L.C.
    
    Black Box Network Services
    
    FloridaNorstan, Inc.
    
    Black Box Network Services
    
    MinnesotaNorstan Communications, Inc.
    
    Black Box Network Services
    
    MinnesotaNextiraOne, LLC
    
    Black Box Network Services
    
    DelawareData Communications 2000, Inc.
    
    Data Communications 2000, Inc.
    
    CaliforniaMilgo Holdings Canada, LLC
    
    Milgo Holdings Canada, LLC
    
    DelawareNextiraOne Canada ULC
    
    NextiraOne Canada ULC
    
    CanadaNextiraOne California L.P.
    
    NextiraOne California L.P.
    
    CaliforniaNXO Installation, LLC
    
    NXO Installation, LLC
    
    DelawareNextiraOne Federal, LLC
    
    Black Box Network Services
    
    DelawareNextiraOne New York, LLC
    
    NextiraOne New York, LLC
    
    DelawareVibes 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.
    
    MinnesotaNu-Vision Technologies, Inc.
    
    Nu-Vision Technologies, Inc.
    
    New YorkNu-Vision Technologies, LLC
    
    Black Box Network Services
    
    New YorkTechnology Supply, Inc.
    
    Black Box Network Services
    
    FloridaTelecommunication Systems Management, Inc.
    
    Black Box Network Services
    
    Virginia
 5