Which IPv4 prefix is a private address range?

Which IPv4 prefix is a private address range?

• A. 192.0.2.0/24
• B. 198.51.100.0/24
• C. 203.0.113.0/24
• D. 10.0.0.0/8

Answer: (D)

Private IPv4 addresses are reserved blocks that are not routable on the public Internet and are intended for use inside organizations, usually with NAT to reach external networks. The well-known private ranges are 10.0.0.0/8, 172.16.0.0/12, and 192.168.0.0/16. Among the given prefixes, 10.0.0.0/8 falls inside that private space, so it is a private address range. The other prefixes are designated for documentation and example use (TEST-NET-1, TEST-NET-2, TEST-NET-3) and are not meant for internal networks, so they aren’t private addresses.

Private IPv4 addresses are reserved blocks that are not routable on the public Internet and are intended for use inside organizations, usually with NAT to reach external networks. The well-known private ranges are 10.0.0.0/8, 172.16.0.0/12, and 192.168.0.0/16. Among the given prefixes, 10.0.0.0/8 falls inside that private space, so it is a private address range. The other prefixes are designated for documentation and example use (TEST-NET-1, TEST-NET-2, TEST-NET-3) and are not meant for internal networks, so they aren’t private addresses.