Which class uses the multicast address range 224.0.0.0 through 239.255.255.255?

• A. Class A
• B. Class B
• C. Class C
• D. Class D

Answer: (D)

Multicast addressing uses a specific block of IPv4 addresses set aside for one-to-many delivery, where one sender can reach multiple receivers that join a group. The range from 224.0.0.0 to 239.255.255.255 is the multicast space and is designated to Class D in the historical IPv4 classful scheme. That’s why this range is used for multicast, not for typical one-to-one unicast communications. In contrast, the classic unicast classes—Class A, Class B, and Class C—cover different first-octet ranges and are not used for multicast purposes. Some addresses within this multicast span are reserved for local network control, and routing behavior depends on scope, but the essential idea is that this 224.0.0.0–239.255.255.255 block is the multicast (Class D) range.