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Exhibit 21
 Subsidiaries of the Registrant
 Organized under the laws of1328556 Ontario Inc.
    
    Ontario, CanadaAC Technologies, Inc.
    
    State of DelawareBay Networks do Brasil Ltd.
    
    BrazilBay Networks Redes de Dados para Sistemas Informaticos, Lda
    
    PortugalBNR Europe Limited
    
    United KingdomBrightspeed SAS
    
    FranceCapital Telecommunications Funding Corporation
    
    CanadaClarify K.K.
    
    JapanClarify Limited
    
    United KingdomCTFC Canada Inc.
    
    CanadaFrisken Investments Pty. Ltd.
    
    New South Wales, AustraliaIntegrated Information Technology Corporation
    
    State of IllinoisIntegrated Networks Limited
    
    United KingdomGuangdong-Nortel Telecommunications Equipment Company Ltd.
    
    Peoples Republic of ChinaLG-Nortel Co. Ltd.
    
    KoreaMatra Communication Cellular Terminals GmbH
    
    GermanyNortel (Management) Limited
    
    United KingdomNortel Australia Communication Systems Pty. Limited
    
    New South Wales, AustraliaNortel Communications Holdings (1997) Limited
    
    IsraelNortel Communications Inc.
    
    OntarioNortel de Mexico, S. de R.L. de C.V.
    
    MexicoNortel Finance France SAS
    
    FranceNortel Government Solutions Incorporated
    
    State of DelawareNortel LearnIT
    
    State of VirginiaNortel Limited
    
    United KingdomNortel Networks (Asia) Limited
    
    Hong KongNortel Networks (Austria) GmbH
    
    AustriaNortel Networks (Barbados) Finance Inc.
    
    BarbadosNortel Networks (Bulgaria) EOOD
    
    BulgariaNortel Networks (CALA) Inc.
    
    State of FloridaNortel Networks (China) Limited
    
    Peoples Republic of ChinaNortel Networks (India) Private Limited
    
    New Delhi, IndiaNortel Networks (Ireland) Limited
    
    IrelandNortel Networks (Luxembourg) S.A.
    
    LuxembourgNortel Networks (Northern Ireland) Limited
    
    Northern IrelandNortel Networks (Photonics) Pty Ltd.
    
    New South Wales, AustraliaNortel Networks (Shannon) Limited
    
    IrelandNortel Networks (Thailand) Ltd.
    
    ThailandNortel Networks AB
    
    SwedenNortel Networks AG
    
    SwitzerlandNortel Networks Applications Management Solutions Inc.
    
    State of DelawareNortel Networks AS
    
    NorwayNortel Networks Australia Pty Limited
    
    AustraliaNortel Networks BV
    
    The NetherlandsNortel Networks Cable Solutions Inc.
    
    State of DelawareNortel Networks Capital Corporation
    
    State of DelawareNortel Networks Chile S.A.
    
    ChileNortel Networks Communications Engineering Ltd.
    
    Peoples Republic of ChinaNortel Networks Communications (Israel) Limited
    
    IsraelNortel Networks de Argentina S.A.
    
    ArgentinaNortel Networks de Bolivia S.A.
    
    Republic of BoliviaNortel Networks de Colombia S.A.
    
    ColombiaNortel
Networks de Guatemala Ltda
    
    GuatemalaNortel Networks de Mexico S.A. de C.V.
    
    Mexico




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Organized under the laws ofNortel Networks de Panama S.A.
    
    Republic of PanamaNortel Networks de Venezuela Compania Anonima
    
    VenezuelaNortel Networks del Ecuador S.A.
    
    Republic of EcuadorNortel Networks del Paraguay S.A.
    
    ParaguayNortel Networks del Uruguay S.A.
    
    UruguayNortel Networks Eastern Mediterranean Ltd.
    
    IsraelNortel Networks Electronics Corporation
    
    CanadaNortel Networks Employee Benefit Trustee Company Limited
    
    United KingdomNortel Networks Engineering Service Kft
    
    HungaryNortel Networks Europe Sales Limited
    
    IrelandNortel Networks Finance LLC
    
    State of DelawareNortel Networks Financial Services Limited Liability Company
    
    HungaryNortel Networks France SAS
    
    FranceNortel Networks Germany GmbH & Co. KG
    
    GermanyNortel Networks Germany Verwaltungs-GmbH
    
    GermanyNortel Networks Global Corporation
    
    CanadaNortel GmbH
    
    GermanyNortel Networks Hispania, S.A.
    
    SpainNortel Networks HPOCS Inc.
    
    State of DelawareNortel Networks Inc.
    
    State of DelawareNortel Networks India International Inc.
    
    State of DelawareNortel Networks India Technology Private Limited
    
    IndiaNortel Networks International Corporation
    
    CanadaNortel Networks International Finance & Holding B.V.
    
    The NetherlandsNortel Networks International Inc.
    
    State of DelawareNortel Networks Israel (Sales and Marketing) Limited
    
    IsraelNortel Networks Japan
    
    JapanNortel Networks Korea Limited
    
    KoreaNortel Networks Malaysia Sdn. Bhd
    
    MalaysiaNortel Networks Malta Limited
    
    MaltaNortel Networks Mauritius Ltd.
    
    MauritiusNortel Networks NV
    
    BelgiumNortel Networks Netas Telekomunikasyon A.S.
    
    TurkeyNortel Networks New Zealand Limited
    
    New ZealandNortel Networks Northern Telecom Services de Argentina S.A.
    
    ArgentinaNortel Networks O.O.O.
    
    RussiaNortel Networks Optical Components Inc.
    
    State of DelawareNortel Networks Optical Components Limited
    
    United KingdomNortel Networks OY
    
    FinlandNortel Networks Peru S.A.C.
    
    PeruNortel Networks Polska Sp. z o.o.
    
    PolandNortel Networks Portugal, S.A.
    
    PortugalNortel Networks Properties Limited
    
    United KingdomNortel Networks Romania Srl
    
    RomaniaNortel Networks S.A.
    
    FranceNortel Networks SA.
    
    LuxembourgNortel Networks S.p.A.
    
    ItalyNortel Networks S.R.O.
    
    Czech RepublicNortel Networks Singapore Pte Ltd.
    
    SingaporeNortel Networks Slovensko, s.r.o.
    
    Slovak RepublicNortel Networks South Africa (Proprietary) Limited
    
    South AfricaNortel Networks Southeast Asia Pte Ltd.
    
    SingaporeNortel Networks Technology (Thailand) Ltd.
    
    ThailandNortel Networks Technology Corporation
    
    Province of Nova ScotiaNortel Networks Technology Ltd.
    
    Cayman Islands




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Organized under the laws ofNortel Networks Telecommunications Equipment (Shanghai) Co., Ltd.
    
    Peoples Republic of ChinaNortel Networks Telecomunicacoes do Brasil Industria e Comercio Ltda
    
    State of Sao Paolo, BrazilNortel Networks Telecomunicacoes Industria e Comercio Ltda
    
    BrazilNortel Networks U.S. Finance Inc.
    
    State of DelawareNortel Networks UK Limited
    
    United KingdomNortel Technology Excellence Centre Private Limited
    
    IndiaNortel Telecomunicaciones S.A.
    
    ColombiaNortel Trinidad and Tobago Limited
    
    Trinidad and TobagoNortel Ukraine Ltd.
    
    UkraineNortel Ventures LLC
    
    State of DelawareNortel Vietnam Limited
    
    VietnamNorthern Telecom Canada Limited
    
    CanadaNorthern Telecom Comunicaciones de Colombia S.A.
    
    ColombiaNorthern Telecom France S.A.
    
    FranceNorthern Telecom International Inc.
    
    State of DelawareNorthern Telecom Maroc SA
    
    MoroccoNorthern Telecom PCN Limited
    
    United KingdomNor.Web DPL Limited
    
    United KingdomPenril Datacomm Limited
    
    United KingdomPeriphonics Limited
    
    United KingdomPromatory Communications (UK) Limited
    
    United KingdomPT Nortel Networks Indonesia
    
    IndonesiaQtera Corporation
    
    State of DelawareR. Betts Investments Pty. Ltd.
    
    New South Wales, AustraliaRegional Telecommunications Funding Corporation
    
    CanadaShenyang Nortel Telecommunications Co., Ltd.
    
    Peoples Republic of ChinaStar 21 Networks GmbH
    
    GermanyTelephone Switching International Limited
    
    United KingdomTSFC Canada Inc.
    
    CanadaX-CEL Communications Limited
    
    United Kingdom