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Multicast Addressing
Administratively Scoped Addresses – rfc2365
- 239.0.0.0–239.255.255.255
- Private address space
- Similar to RFC1918 unicast addresses
- Not used for global Internet traffic
- Used to limit “scope” of multicast traffic
- Same addresses may be in use at different locations for different multicast sessions
- Examples
- Site-local scope: 239.253.0.0/16
- Organization-local scope: 239.192.0.0/14
Notes:
IANA Reserved Addresses
IANA is the responsible Authority for the assignment of reserved class D addresses. Other interesting reserved addresses are:
224.0.0.2 - PIMv1 (ALL-ROUTERS - due to transport in IGMPv1)
224.0.0.5 - OSPF ALL ROUTERS (RFC1583)
224.0.0.6 - OSPF DESIGNATED ROUTERS (RFC1583)
224.0.0.9 - RIP2 Routers
224.0.0.13 - PIMv2
224.0.1.39 - CISCO-RP-ANNOUNCE (Auto-RP)
224.0.1.40 - CISCO-RP-DISCOVERY (Auto-RP)
“ftp://ftp.isi.edu/in-notes/iana/assignments/multicast-addresses” is the authoritative source for reserved multicast addresses.
Additional Information
"Administratively Scoped IP Multicast", June 1997, has a good discussion on scoped addresses. This document is available at:
“draft-ietf-mboned-admin-ip-space-03.txt”