Exhibit 21.1
 SUBSIDIARIES OF THE REGISTRANT
 State or OtherJurisdiction ofIncorporation orLegal Name
    
    Doing Business As
    
    OrganizationBlack Box Corporation
    
    Black Box Corporation
    
    DelawareADS Telecom,
Inc.
    
    Black Box Network Services
    
    FloridaB & C Telephone, Inc.
    
    Black Box Network Services
    
    WashingtonBlack Box Network Services
 SpokaneBBox Holding Company
    
    BBox Holding Company
    
    DelawareAdvanced 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 VirginiaAtimco 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
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 Service Bayern GmbH
    
    Black Box Netzwerk Service Bayern GmbH
    
    GermanyBlack Box Netzwerkservice Stuttgart GmbH
    
    Black Box Netzwerkservice Stuttgart GmbH
    
    GermanyBlack 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 Islands




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State or OtherJurisdiction ofIncorporation orLegal Name
    
    Doing Business As
    
    OrganizationBlack Box France
    
    Black Box France
    
    FranceBlack Box Ile De France
    
    Black Box Ile De France
    
    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, Inc.  Government
    
    Black Box Network Services, Inc.  Government
    
    TennesseeSolutions
    
    SolutionsCable Consultants, Incorporated
    
    Black Box Network Services  Atlanta
    
    GeorgiaComm Line, Inc.
    
    Black Box Network Services
    
    OhioCommunication 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
    
    California
 2




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State or OtherJurisdiction ofIncorporation orLegal Name
    
    Doing Business As
    
    OrganizationIntegrated 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 EnglandTeldata 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
    
    SwedenBlack Box
Chile S.A.
    
    Black Box Chile S.A.
    
    ChileBlack 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) Limited
    
    Black Box Network Services
(Dublin) Limited
    
    IrelandBlack Box
Network Services (Gouda) B.V.
    
    Black Box Network Services (Gouda)
B.V.
    
    NetherlandsBlack Box Network Services NW AG
    
    Black Box Network Services NW AG
    
    Switzerland
 3




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State or OtherJurisdiction ofIncorporation orLegal Name
    
    Doing Business As
    
    OrganizationBlack Box Network Services Puebla S.A. de C.V.
    
    Black Box Network Services Puebla S.A. de C.V.
    
    MexicoBlack Box Network Services S.r.l.
    
    Black Box Network Services S.r.l.
    
    ItalyBlack Box Network Services SDN. BHD.
    
    Black Box Network Services SDN. BHD.
    
    MalaysiaBlack Box Network Services Singapore Pte Ltd.
    
    Black Box Network Services Singapore Pte Ltd.
    
    SingaporeBlack Box
Network Services (UK) Limited
    
    Black Box Network Services (UK)
Limited
    
    EnglandBlack Box Network Services (UK)
Limited Northern IrelandBlack Box Norge AS
    
    Black Box Norge AS
    
    NorwayBlack Box
Services Reseaux Mediterranee
    
    Black Box Services Reseaux Mediterranee
    
    FranceConsultoria en Redes, S.A. de C.V.
    
    Consultoria en Redes, S.A. de C.V.
    
    MexicoJC Informatica Integral, S.A. de C.V.
    
    JC Informatica Integral, S.A. de C.V.
    
    MexicoLanetwork Sales Ltd.
    

Lanetwork Sales Ltd.
    
    CanadaNorstan, Inc.
    
    Black Box Network Services
    
    MinnesotaNorstan Communications, Inc.
    
    Black Box Network Services
    
    MinnesotaNextiraOne, LLC
    
    Black Box Network Services
    
    DelawareBlack Box Network
Services  IllinoisData 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
Black Box Network Services  Federal
    
    DelawareNextiraOne New York, LLC
    
    Black Box Network Services
    
    DelawareVibes Technologies, Inc.
    
    Black Box Resale Services
    
    Minnesota
 4




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State or OtherJurisdiction ofIncorporation orLegal Name
    
    Doing Business As
    
    OrganizationNorstan International, Inc.
    
    Norstan International, Inc.
    
    MinnesotaNorstan Canada Inc.
    
    Norstan Canada Inc.
    
    MinnesotaNorstan
Canada, Ltd./Norstan Canada, Ltee
    
    Black Box Network Services
    
    CanadaNorstan Financial Services, Inc.
    
    Norstan Financial Services, Inc.
    
    MinnesotaNortech
Telecommunications Inc.
    
    Black Box Network Services  Elk
Grove
    
    IllinoisNu-Vision Technologies, Inc.
    
    Black Box Network Services
    
    New YorkNu-Vision Technologies, LLC
    
    Black Box Network Services
    
    New YorkBCS II, LLC
    
    BCS II, LLC
    
    DelawareUCI
Communications LLC
    
    UCI
Communications LLC
    
    South Carolina
 5