Do Class D addresses have valid host addresses?

• A. No
• B. Yes
• C. Only for some devices
• D. Only in certain networks

Answer: (A)

Class D addresses are reserved for multicast, not for identifying a single host. An IPv4 multicast address identifies a group of hosts that have joined that group, and traffic sent to the multicast address is delivered to all members of the group. Because there isn’t a unique host identifier within a multicast address, there is no valid host address in Class D. Devices don’t assign or rely on a per-host portion for these addresses; they simply join the multicast group to receive traffic. The multicast range is 224.0.0.0 to 239.255.255.255, reinforcing that these addresses are for group delivery, not individual hosts.