This page contains all the Multicast IP Addresses and shows what protocol they are mapped to. Should you ever use a packet sniffer to try and see what's on the network and you capture a packet with a destination IP Address of 224.X.X.X, then simply look up this list and you will know what the purpose of that packet was :)
Internet Multicast Addressess
Host Extensions for IP Multicasting [RFC1112] specifies the extensions required of a host implementation of the Internet Protocol (IP) to support multicasting. Current addresses are listed below.
The range of addresses between 220.127.116.11 and 18.104.22.168, inclusive, is reserved for the use of routing protocols and other low-level topology discovery or maintenance protocols, such as gateway discovery and group membership reporting. Multicast routers should not forward
any multicast datagram with destination addresses in this range, regardless of its TTL.
22.214.171.124 Base Address (Reserved) [RFC1112,JBP]
126.96.36.199 All Systems on this Subnet [RFC1112,JBP]
188.8.131.52 All Routers on this Subnet [JBP]
184.108.40.206 Unassigned [JBP]
220.127.116.11 DVMRP Routers [RFC1075,JBP]
18.104.22.168 OSPFIGP OSPFIGP All Routers [RFC1583,JXM1]
22.214.171.124 OSPFIGP OSPFIGP Designated Routers [RFC1583,JXM1]
126.96.36.199 ST Routers [RFC1190,KS14]
188.8.131.52 ST Hosts [RFC1190,KS14]
184.108.40.206 RIP2 Routers [RFC1723,GSM11]
220.127.116.11 IGRP Routers [Dino Farinacci]
18.104.22.168 Mobile-Agents [Bill Simpson]
22.214.171.124 DHCP Server / Relay Agent [RFC1884]
126.96.36.199 - 188.8.131.52 Unassigned [JBP]
184.108.40.206 "rwho" Group (BSD) (unofficial) [JBP]
220.127.116.11 SUN RPC PMAPPROC_CALLIT [BXE1]
224.0.3.000-18.104.22.168 RFE Generic Service [DXS3]
224.0.4.000-22.214.171.124 RFE Individual Conferences [DXS3]
224.0.5.000-126.96.36.199 CDPD Groups [Bob Brenner]
188.8.131.52-184.108.40.206 Unassigned [IANA]
224.0.6.000-220.127.116.11 Cornell ISIS Project [Tim Clark]
18.104.22.168-22.214.171.124 Unassigned [IANA]
224.0.7.000-126.96.36.199 Where-Are-You [Simpson]
224.0.8.000-188.8.131.52 INTV [Tynan]
224.0.9.000-184.108.40.206 Internet Railroad [Malamud]
220.127.116.11-18.104.22.168 ST Multicast Groups [RFC1190,KS14]
22.214.171.124-126.96.36.199 Multimedia Conference Calls [SC3]
188.8.131.52-184.108.40.206 DIS transient groups [Joel Snyder]
220.127.116.11-18.104.22.168 VMTP transient groups [RFC1045,DRC3]
These addresses are listed in the Domain Name Service under MCAST.NET
Note that when used on an Ethernet or IEEE 802 network, the 23
low-order bits of the IP Multicast address are placed in the low-order
23 bits of the Ethernet or IEEE 802 net multicast address
22.214.171.124.0.0. See the section on "IANA ETHERNET ADDRESS BLOCK".
[RFC1045] Cheriton, D., "VMTP: Versatile Message Transaction
Protocol Specification", RFC 1045, Stanford University,
[RFC1075] Waitzman, D., C. Partridge, and S. Deering "Distance Vector
Multicast Routing Protocol", RFC-1075, BBN STC, Stanford
University, November 1988.
[RFC1112] Deering, S., "Host Extensions for IP Multicasting",
STD 5, RFC 1112, Stanford University, August 1989.
[RFC1119] Mills, D., "Network Time Protocol (Version 1), Specification
and Implementation", STD 12, RFC 1119, University of
Delaware, July 1988.
[RFC1190] Topolcic, C., Editor, "Experimental Internet Stream
Protocol, Version 2 (ST-II)", RFC 1190, CIP Working Group,
[RFC1583] Moy, J., "The OSPF Specification", RFC 1583, Proteon,
[RFC1723] Malkin, G., "RIP Version 2: Carying Additional Information",
RFC 1723, Xylogics, November 1994.
[RFC1884] Hinden, R., and S. Deering, "IP Version 6 Addressing
Architecture", RFC 1884, Ipsilon Networks, Xerox PARC,