IP Address Traffic



To select different multicast addresses.


IP address


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 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 IP multicast addresses from: to are either reserved or assigned to a multicasting application. to ( are reserved for applications that can be administratively scoped.

The following are examples of reserved IP multicast addresses:–all hosts on this subnet.–all routers on this subnet.–Open Shortest Path First (OSPF) Version 2, designed to reach all OSPF routers on a network.–OSPF Version 2, designed to reach all OSPF designated routers on a network.–Routing Information Protocol (RIP) Version 2.–Network Time Protocol.

For the latest list of reserved multicast addresses, visit the Information Sciences Institute web site.

Default Value

 Caution: If you change the address, make sure that you change it on all the machines, in order to insure that they will continue "talking" with each other.


More information

Global parameters.