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Multicast address

In computer networking a multicast address is an identifier for a group of hosts that have joined a multicast group. Within IP it is historically known as a class d address, a type of IP address. It ranges from to or Address assignments out of this range are specified in the IETF 'best current practice' document (ftp://ftp.isi.edu/in-notes/bcp/bcp51.txt) also known as RFC 3171.

The to range is assigned to multicasting on the local LAN only. Well known examples are RIP which uses and OSPF uses

The range has been assigned as public multicast address space that is aligned along autonomous system number allocations. Each byte of the AS number corresponds to the second and third octets[?] of the multicast address.

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