Which of the following IP address ranges are not multicast address ranges? (Multiple choice)

Question

Options

• A192.168.0.0-192.168.255.255
• B239.0.0.0-239.255.255.255
• C198.1.0.0-198.1.255.255
• D224.0.0.0-224.0.0.255

• A
  84% (43)
• B
  6% (3)
• D
  10% (5)

Explanation

Options A and C are correct because neither falls within the multicast address space. 192.168.0.0–192.168.255.255 (A) is a private unicast range defined by RFC 1918, commonly used in home and enterprise LANs. 198.1.0.0–198.1.255.255 (C) is a public unicast range - simply a block of regular routable addresses.

The distractors (B and D) are both genuine multicast ranges: the entire IPv4 multicast block spans 224.0.0.0–239.255.255.255 (Class D), so 224.0.0.0–224.0.0.255 (D) sits at the very start (well-known link-local multicast, e.g., OSPF, IGMP), and 239.0.0.0–239.255.255.255 (B) sits at the very end (administratively scoped / private multicast).

Memory tip: Multicast = "224 to 239" - any address starting with 224–239 in the first octet is multicast. If the first octet is below 224 or above 239, it's not multicast. Since 192 and 198 both fall well below 224, A and C are immediately ruled out as multicast.

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