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Asked: 2026-05-11T05:53:22+00:00

As far as I know, I have added no internet access in my .net

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As far as I know, I have added no internet access in my .net windows forms application. But every so often it attempts an outgoing connection to 239.255.255.250. I have no idea why this is happening. Is it something in the .net framework?

Info for 239.255.255.250:

OrgName:    Internet Assigned Numbers Authority  OrgID:      IANA Address:    4676 Admiralty Way, Suite 330 City:       Marina del Rey StateProv:  CA PostalCode: 90292-6695 Country:    US  NetRange:   224.0.0.0 - 239.255.255.255  CIDR:       224.0.0.0/4  NetName:    MCAST-NET NetHandle:  NET-224-0-0-0-1 Parent:      NetType:    IANA Special Use NameServer: FLAG.EP.NET NameServer: STRUL.STUPI.SE NameServer: NS.ISI.EDU NameServer: NIC.NEAR.NET Comment:    This block is reserved for special purposes. Comment:    Please see RFC 3171 for additional information. Comment:     RegDate:    1991-05-22 Updated:    2002-09-16
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1 Answer

  1. I’d guess it isn’t a big deal. References for your viewing pleasure:

    Questions for you:

    • How do you know it’s your windows app? ZoneAlarm.
    • Are you using multicast for anything? No.
    • Are you running any multicast apps or apps that might use uPNP? No.
    • Are you doing any networking with your app? If so, what classes are you using?

    Try this the next time you see the alert:

    Start> Run> cmd.exe: netstat /b /o

    That might give you more information on where the alert is coming from.

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