Class D

• Class D addresses are reserved for multicasting. Multicasting is the sending of a stream of data to multiple computers simultaneously.

• Many routers forward multicasts, and computers configured to receive the multicast information accept the packets and can receive the data stream.

• Since Class D addresses must have 1110 as their first four binary digits, the range for Class D starts with decimal 224 and ends at 239 in the first octet.

1

1 1 1 0 0 0 0 0 = 224

1 1 1 0 1 1 1 1 = 239

First Class D address

First Class D address

Figure 3-8 Class D addresses

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