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EXHIBIT No. 21 Tellabs Inc. and Subsidiaries
Subsidiaries of the Registrant
as of December 31, 2004 Name
    
    State or Other Jurisdictionof IncorporationTellabs San Jose, Inc.
    
    DelawareTellabs Reston, Inc.
    
    DelawareWhite Oak Merger Corp.
    
    DelawareNetCore Systems, Inc.
    
    DelawareSalix Technologies, Inc.
    
    DelawareFuture Networks, Inc.
    
    GeorgiaVinci Systems, Inc.
    
    DelawareTellabs Petaluma, Inc.
    
    DelawareAdvanced Fibre Technology Communications (HK) Limited
    
    Hong KongHangzhou AFTEK Communication Company, Ltd.
    
    ChinaAdvanced Fibre Communications (HK) Limited
    
    Hong KongAFC Foreign Sales Corporation
    
    U.S. Virgin IslandsTellabs North America, Inc.
    
    DelawareTellabs Bedford, Inc.
    
    DelawareAccessLan India
    
    IndiaAFC India Private Limited
    
    IndiaAdvanced Fibre Communications International GmbH
    
    SwitzerlandAdvanced Fibre Communications Mexico S. de R.L. de C.V.
    
    MexicoAdvanced Fibre Communications France S.A.S.
    
    FranceAdvanced Fibre Communications International Limited
    
    Cayman IslandsAdvanced Fibre Communications U.K. Limited
    
    United KingdomAFC Nevada Holding Corporation
    
    NevadaAFC Treasury Holdings Corporation
    
    NevadaAFC Equity Holdings Corporation
    
    NevadaAFC Securities Holdings Corporation
    
    NevadaAFC Harris Multimedia Communications Private Limited
    
    MauritiusAFC Harris Multimedia Communications Limited
    
    IndiaTellabs Mexico, Inc.
    
    DelawareTellabs de Mexico, S.A. de C.V.
    
    MexicoTellabs TG, Inc.
    
    DelawareTellabs Transport Group, Inc.
    
    QuebecTellabs Operations, Inc.
    
    DelawareTelecommuncations Laboratories, Inc.
    
    DelawareTelecon Acquisition Corp.
    
    DelawareTellabs Export, Inc.
    
    DelawareTellabs Japan, Inc.
    
    DelawareTellabs Manufacturing, Inc.
    
    DelawareTellabs International, Inc.
    
    IllinoisTellabs Communications Canada Ltd.
    
    CanadaTellabs do Brazil, Ltda.
    
    BrazilTellabs H.K. Ltd.
    
    Hong KongTellabs Pty. Ltd.
    
    AustraliaTellabs International de Mexico
    
    MexicoTellabs Asia Pacific Private Limited
    
    SingaporeTellabs (Thailand) Co., Ltd.
    
    ThailandTellabs Korea, Inc.
    
    KoreaTellabs India Private Limited
    
    IndiaTellabs Communications International Ltd.
    
    ChinaTellabs de Venezuela, S.A.
    
    VenezuelaTellabs Communications (Malaysia) Sdn Bhd
    
    MalaysiaTellabs Malaysia Sdn Bhd (49% joint venture)
    
    MalaysiaTellabs Holdings, B.V.
    
    The NetherlandsTellabs Enterprises B.V.
    
    The NetherlandsTellabs Oy
    
    FinlandKiinteisto Oy Mestarinkaare
    
    FinlandKiinteisto Oy Sinimaentie 6
    
    FinlandTellabs Denmark A/S
    
    DenmarkTellabs Communications (India) Private Limited
    
    IndiaFIBCOM India Ltd (40% Joint Venture)
    
    IndiaTellabs Holdings, Ltd.
    
    IrelandTellabs (Ireland) Ltd
    
    IrelandTellabs Ltd.
    
    Ireland




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EXHIBIT No. 21

Name
    
    State or Other Jurisdictionof IncorporationTellabs Research Ltd.
    
    IrelandTellabs Communications Ireland Limited
    
    IrelandTellabs Communications Technologies
    
    IrelandTellabs EMEA Holdings, Ltd.
    
    IrelandTellabs AB
    
    SwedenTellabs (S.A.) (Proprietary) Limited
    
    South AfricaTellabs SAS
    
    FranceTellabs Italia S.r.l.
    
    ItalyTellabs Netherlands B.V.
    
    The NetherlandsTellabs Poland Sp. z o.o.
    
    PolandTellabs Southern Europe S.A.
    
    SpainTellabs Gmbh
    
    GermanyTellabs Austria Vertriebs GmbH
    
    AustriaTellabs Norway A/S
    
    NorwayTellabs U.K. Ltd.
    
    United KingdomTellabs Communications UK Limited
    
    United KingdomE. Coherent Communications Systems Ltd.
    
    United Kingdom