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The beginning of the Class D range of IP multicast addresses.

IP multicast addresses, also known as group addresses, are in the Class D range of to as defined by setting the first four high order bits to 1110. In network prefix or Classless Inter-Domain Routing (CIDR) notation, IP multicast addresses are summarized as IP Multicast addresses in the range to ( are reserved for the local subnet and are not forwarded by IP routers regardless of the Time to Live (TTL) in the IP header. The following are examples of reserved IP multicast addresses:

Elaboration from http://www.microsoft.com/technet/columns/cableguy/cg0202.asp

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