Multicast IP Addressing

Last modified 24 Sep 2009 at 17:43 UTC
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Class D IP addresses are used for multicast destinations. (The first four bits will be 1110.)

Address Ranges

Range: 224.0.0.0/24

Packets are transmitted with a TTL of 1, ensuring traffic never leaves the local segment.

Some well-known examples are:

  • 224.0.0.1 - All hosts
  • 224.0.0.5 - All OSPF routers
  • 224.0.0.6 - All OSPF DRs
  • 224.0.0.9 - All RIPv2 routers
  • 224.0.0.10 - All EIGRP routers

Source-specific

Range: 232.0.0.0/8

Hosts are configured to only receive traffic from a specific server.

GLOP

Range: 233.0.0.0/8

Allocates 256 multicast IP addresses to each registered AS. The ASN is used to fill the middles two octets. For example, AS1000 receives 233.3.232.0/24 ((3 * 256) + 232).

Administratively Scoped

Range: 239.0.0.0/8

Used within private multicast domains; similar to the private RFC 1918 address ranges. Within this range, 239.252.0.0/14 is reserved for site-local multicast, and the rest of 239.192.0.0/10 is reserved for org-local scope.

Globally Scoped

Ranges: 224.0.1.0 - 231.255.255.255 and 234.0.0.0 - 238.255.255.255

This is the bulk of the multicast range. Global addresses may be routed across the Internet and are generally only temporarily assigned.

Last modified 24 Sep 2009 at 17:43 UTC by stretch

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