15.1.1 IPv4 multicast address

Class D IP addresses are used for multicast communication. A multicast address is a logical group address that exists only within a group participating in the sending and receiving of multicast data. Addresses range from 224.0.0.0 to 239.255.255.255. However, 224.0.0.0 to 224.0.0.255 are reserved. The following figure shows the multicast address format.

Figure 15-2: Multicast address format