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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 Ltda.
    
    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 Networks Limited.
    
    United KingdomGuangdong-Nortel Telecommunications Equipment Company Ltd.
    
    Peoples Republic of ChinaLG-Nortel Co. Ltd.
    
    KoreaMatra Communications Business Systeme GmbH Germany.
    
    GermanyMatra Communication Cellular Terminals GmbH.
    
    GermanyNortel 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 Government Solutions Incorporated.
    
    State of DelawareNortel Limited.
    
    United KingdomNortel Networks (Asia) Limited.
    
    Hong KongNortel Networks (Austria) GmbH.
    
    AustriaNortel 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 (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.
    
    MexicoNortel Networks de Panama S.A.
    
    Republic of PanamaNortel Networks de Venezuela C.A.
    
    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.
    
    Israel




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Organized under the laws ofNortel Networks Electronics Corporation.
    
    CanadaNortel Networks Employee Benefit Trustee Company Limited.
    
    United KingdomNortel Networks Engineering Service Kft.
    
    HungaryNortel Networks Europe Sales Limited.
    
    IrelandNortel Networks Financial Services Limited Liability Company.
    
    HungaryNortel Networks France SAS.
    
    FranceNortel 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 IslandsNortel 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 UK Limited.
    
    United KingdomNortel Technology Excellence Centre Private Limited.
    
    IndiaNortel Trinidad and Tobago Limited.
    
    Trinidad and TobagoNortel Ukraine Ltd.
    
    UkraineNortel Ventures LLC.
    
    State of DelawareNortel Vietnam Limited.
    
    VietnamNorthern Telecom Canada Limited.
    
    Canada




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Organized under the laws ofNorthern Telecom France SA.
    
    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 ChinaSonoma Systems Europe Limited.
    
    United KingdomStar 21 Networks GmbH.
    
    GermanyTelephone Switching International Limited.
    
    United KingdomThe Nortel Foundation.
    
    State of VirginiaTSFC Canada Inc.
    
    CanadaX-CEL Communications Limited.
    
    United Kingdom