Which of the following IPv4 networks are reserved by IANA for private address assignment and private routing? (Choose three.)

The correct answer is A. 10.0.0.0/8 D. 172.16.0.0/12 E. 192.168.0.0/16. RFC 1918 defines three blocks reserved for private address assignment and private routing: 10.0.0.0/8 (Class A, ~16.7 million addresses), 172.16.0.0/12 (Class B range covering 172.16.0.0–172.31.255.255), and 192.168.0.0/16 (Class C, the most common home/office range) - these…

Networking Fundamentals

Question

Which of the following IPv4 networks are reserved by IANA for private address assignment and private routing? (Choose three.)

Options

A10.0.0.0/8
B127.0.0.0/8
C169.255.0.0/16
D172.16.0.0/12
E192.168.0.0/16

How the community answered

(49 responses)

A
73% (36)
B
8% (4)
C
18% (9)

Explanation

RFC 1918 defines three blocks reserved for private address assignment and private routing: 10.0.0.0/8 (Class A, ~16.7 million addresses), 172.16.0.0/12 (Class B range covering 172.16.0.0–172.31.255.255), and 192.168.0.0/16 (Class C, the most common home/office range) - these are A, D, and E.

B (127.0.0.0/8) is wrong because it's the loopback range (localhost), not a private routable range - traffic to this block never leaves the host interface. C (169.255.0.0/16) is a trap: the actual APIPA/link-local range is 169.254.0.0/16 (assigned automatically when DHCP fails), not 169.255 - the question shifts the third octet by one to create a plausible-looking distractor.

Memory tip: Use the phrase "All Computers Require Networks" mapped to the three starting octets - 10, 172.16, 192.168 - or just remember them by class size: one giant /8, one medium /12, one small /16.

Topics

#IPv4 addressing#RFC 1918 private networks#CIDR notation#IANA address allocation

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