Previous Topic: IP Multicast or MCASTNext Topic: UDP Operation and Limitations

Transfer Protocols and Mechanisms › IP Multicast or MCAST › Reserved and Registered Multicast Addresses

Reserved and Registered Multicast Addresses

The Internet Assigned Numbers Authority (IANA) maintains a list of registered IP multicast groups, which are listed in the following table:

Address

Reserved for

224.0.0.0

The base address; cannot be assigned to any group.

224.0.0.1 to 224.0.0.255

Local Scope Addresses; used for routing protocols and other low-level topology discovery or maintenance protocols. Multicasts in this range are never forwarded off the local network, regardless of TTL. Multicast routers should not forward a multicast datagram with a destination address in this range, regardless of its TTL.

224.0.1.0 to 238.255.255.255

Global Scope Addresses; used for multicast group addresses. Some of the well-known groups include the following:

All systems on this subnet (224.0.0.1)
All routers on this subnet (224.0.0.2)
All DVMRP routers (224.0.0.4)
All OSPF routers (224.0.0.5)
IETF-1-Audio (224.0.1.11)
IETF-1- Video (224.0.1.12)
AUDIONEWS (224.0.1.7)
MUSIC- SERVICE (224.0.1.16)

239.0.0.0 to 239.255.255.255

Administratively Scoped Addresses; used for private domains for local site applications, not Internet-wide applications.