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LFCS · Question #51

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

The correct answer is B. 10.0.0.0/8 D. 172.16.0.0/12 E. 192.168.0.0/16. This question identifies the three IPv4 address ranges reserved by IANA (RFC 1918) for private network assignments and private routing, which are not globally routable.

Submitted by joshua94· Apr 18, 2026Networking

Question

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

Options

  • A127.0.0.0/8
  • B10.0.0.0/8
  • C169.255.0.0/16
  • D172.16.0.0/12
  • E192.168.0.0/16

How the community answered

(38 responses)
  • A
    8% (3)
  • B
    89% (34)
  • C
    3% (1)

Why each option

This question identifies the three IPv4 address ranges reserved by IANA (RFC 1918) for private network assignments and private routing, which are not globally routable.

A127.0.0.0/8

127.0.0.0/8 is reserved for loopback addresses (e.g., 127.0.0.1) and is not used for general private network assignment.

B10.0.0.0/8Correct

The 10.0.0.0/8 network is one of the three designated private address ranges, offering a large block of addresses suitable for large organizations.

C169.255.0.0/16

169.254.0.0/16 (not 169.255.0.0/16 as specified in choice C, but close enough to address the intent) is reserved for Automatic Private IP Addressing (APIPA) or link-local addresses, used when a DHCP server is unavailable, and is not an RFC 1918 private range.

D172.16.0.0/12Correct

The 172.16.0.0/12 network is another RFC 1918 private address range, providing a mid-sized block of addresses.

E192.168.0.0/16Correct

The 192.168.0.0/16 network is the third RFC 1918 private address range, commonly used for smaller networks like home or small office environments.

Concept tested: IPv4 private address ranges (RFC 1918)

Source: https://datatracker.ietf.org/doc/html/rfc1918

Topics

#IPv4 private addresses#IANA#RFC 1918#Network addressing

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