What is 224.0.0.1?

[Steve Fatula]

This shows up constantly in my IPFW denied packets log. Just wondering if this is a Atjeu service, or something else? Happens every 2 minutes.

[Atjeu]

Definitely nothing Atjeu. No idea whose IP that is

[Atjeu]

thats assigned to IANA so its an overseas assigned block or not assigned to anyone at all.

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

OrgAbuseHandle: IANA-IP-ARIN
OrgAbuseName: Internet Corporation for Assigned Names and Number
OrgAbusePhone: +1-310-301-5820
OrgAbuseEmail: abuse@iana.org

OrgTechHandle: IANA-IP-ARIN
OrgTechName: Internet Corporation for Assigned Names and Number
OrgTechPhone: +1-310-301-5820
OrgTechEmail: abuse@iana.org

[jsr]

224.0.0.0-239.255.255.255 is used for multicast.
It has been a while since I worked with multicast so I don't remember all of the details of how it works, but it is probably a harmless packet sent to everyone polling for group membership.

More info:
http://www.iana.org/assignments/multicast-addresses