Answer / sreevani

Every IP multicast group has a group address. IP multicast
provides only open groups: That is, it is not necessary to
be a member of a group in order to send datagrams to the
group.

Multicast address are like IP addresses used for single
hosts, and is written in the same way: A.B.C.D. Multicast
addresses will never clash with host addresses because a
portion of the IP address space is specifically reserved
for multicast.

This reserved range consists of addresses from 224.0.0.0 to
239.255.255.255. However, the multicast addresses from
224.0.0.0 to 224.0.0.255 are reserved for multicast routing
information; Application programs should use multicast
addresses outside this range.

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