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Exhibit 21.1 SUBSIDIARIES OF THE REGISTRANT The following lists the subsidiaries of WebMD Corporation: Name
    
    Jurisdiction of IncorporationWebMD Corporation
    
    
    Delaware225 Summit
Associates LLC
    
    
    DelawareCLD Corporation
    
    
    DelawareEnvoy Corporation
    
    
    DelawareAdvanced Business Fulfillment, LLC
    
    
    DelawareCareInsite LLC
    
    
    MassachusettsTHINC, LLC
    
    
    New YorkTHINC Acquisition Corp.
    
    
    DelawareClaims Processing Service, Inc.
    
    
    ConnecticutDakota Imaging, Inc.
    
    
    MarylandDakota Imaging, S.A.
    
    
    Costa RicaEnvoy/ExpressBill, Inc.
    
    
    TennesseeKinetra LLC
    
    
    DelawareIMS  Net of Arkansas, Inc.
    
    
    ArkansasIMS  Net of Central Florida, Inc.
    
    
    ColoradoIMS  Net of Colorado, Inc.
    
    
    ColoradoIMS  Net of Illinois, Inc.
    
    
    IllinoisIllinois Medical Information Network, Inc.
    
    
    IllinoisMinnesota Medical Communication Network, LLC
    
    
    ColoradoMediFAX-EDI Holding Company
    
    
    DelawareMediFAX-EDI LLC
    
    
    TennesseeMedi, Inc.
    
    
    CaliforniaMediFAX, Inc.
    
    
    TennesseeMedWare Solutions, Inc.
    
    
    FloridaMediFAX-EDI Holdings, Inc.
    
    
    DelawareMediFAX-EDI Services, Inc.
    
    
    DelawareViPS, Inc.
    
    
    MarylandViPS BioMedical Services, Inc.
    
    
    PennsylvaniaWebMD Clinical Services, LLC
    
    
    DelawareHealtheon Software India Pvt. Ltd.
    
    
    IndiaHealtheon/WebMD Cable Corporation
    
    
    DelawareHealtheon/WebMD Internet Corporation
    
    
    DelawareHW International Holdings, Inc.
    
    
    DelawareWebMD International, LLC
    
    
    DelawareWebMD Canada Ventures, Inc.
    
    
    CanadaWebMD UK Limited
    
    
    England and WalesHW Japan, Inc.
    
    
    DelawareMedE America Corporation
    
    
    DelawareHealthcare Interchange, Inc.
    
    
    MissouriMedE America Corporation of Ohio
    
    
    OhioOnHealth Network Company
    
    
    WashingtonBabyData.com, Inc.
    
    
    DelawareDemand Management, Inc.
    
    
    ColoradoHealth Decisions, Inc.
    
    
    ColoradoHealth Decisions International, LLC
    
    
    ColoradoThe Ornish Health Program, Inc.
    
    
    CaliforniaPRX Holdings Corp.
    
    
    DelawareSNTC Holding, Inc.
    
    
    DelawarePorex Corporation
    
    
    DelawareMupor Limited
    
    
    EnglandPorex Technologies GmbH
    
    
    GermanyEsters
Filtertechnik Produktions GmbH
    
    
    GermanyPorex Products Malaysia SDN, BHD
    
    
    MalaysiaPorex Surgical Inc.
    
    
    DelawarePorex Surgical GmbH
    
    
    GermanySYN Healthcare Service, Inc.
    
    
    California




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Name
    
    Jurisdiction of IncorporationSYNC Corp.
    
    
    New JerseyWebMD Domain Corp.
    
    
    DelawareWebMD, Inc.
    
    
    GeorgiaBoca Subsidiary Corp.
    
    
    DelawareEndeavor Technologies, Inc.
    
    
    GeorgiaHealthShare Technology, Inc.
    
    
    DelawareMMM Acquisition Company
    
    
    DelawareMedscape Portals, Inc.
    
    
    DelawareMedscape LLC
    
    
    DelawareMDhub, LLC
    
    
    ConnecticutMedicineNet, Inc.
    
    
    CaliforniaNational Physicians DataSource, LLC
    
    
    ConnecticutOW Corp
    
    
    DelawarePhysicians Telephone Directory, Inc.
    
    
    ConnecticutRxList, Inc.
    
    
    DelawareRxList LLC
    
    
    CaliforniaTelemedics, Inc.
    
    
    GeorgiaWellmed, Inc.
    
    
    DelawareWebMD Practice Services, Inc.
    
    
    DelawareAdaptive Health Systems of Arizona, Inc.
    
    
    ArizonaMedical Manager PCN, Inc.
    
    
    DelawareBenchmark Systems, Inc. of Louisiana
    
    
    LouisianaMedical Manager Research & Development, Inc.
    
    
    FloridaPeachtree Associates, Inc.
    
    
    GeorgiaPersonal Best!, Inc.
    
    
    North CarolinaUnited Software Architects, Inc.
    
    
    Texas