Implementation of Multicasting
Sending a multicast message has a few differences when compared to unicast message transmission. In unicasting, when a message needs to be sent to a destination, the source and the destination address have to be specified. However, in the case of multicasting a message, all hosts receiving the message must be represented by a single name, which is also referred to as a multicast group. Special addresses are reserved for representing broadcasting and multicasting because addresses used for unicasting a message are different from multicast group addresses. The class D addresses in the IPv4 address space are reserved for multicasting addresses.
→ For more information on address classes, see “The Network Interface ...
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