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LFCS · Question #457

Which of the following IP networks does RFC1918 reserve for use on private intranets?(Choose two)

The correct answer is A. 10.0.0.0 E. 192.168.0.0. RFC 1918 defines specific IP address blocks for use in private intranets, including the 10.0.0.0/8 and 192.168.0.0/16 ranges.

Submitted by weili_xi· Apr 18, 2026Networking

Question

Which of the following IP networks does RFC1918 reserve for use on private intranets?(Choose two)

Options

  • A10.0.0.0
  • B224.0.0.0
  • C199.14.0.0
  • D172.152.0.0
  • E192.168.0.0

How the community answered

(36 responses)
  • A
    86% (31)
  • B
    8% (3)
  • C
    3% (1)
  • D
    3% (1)

Why each option

RFC 1918 defines specific IP address blocks for use in private intranets, including the 10.0.0.0/8 and 192.168.0.0/16 ranges.

A10.0.0.0Correct

The 10.0.0.0/8 (10.0.0.0 - 10.255.255.255) address range is one of the three private IP address blocks reserved by RFC 1918 for use within private networks, suitable for very large organizations.

B224.0.0.0

224.0.0.0 is the start of the Class D range, reserved for multicast addressing, not private intranets as per RFC 1918.

C199.14.0.0

199.14.0.0 is a public IP address range and is not reserved for private use by RFC 1918.

D172.152.0.0

While 172.16.0.0/12 is a private range, 172.152.0.0 falls outside this specific private block (172.16.0.0 - 172.31.255.255) and is considered a public IP address.

E192.168.0.0Correct

The 192.168.0.0/16 (192.168.0.0 - 192.168.255.255) address range is one of the three private IP address blocks reserved by RFC 1918 for use within private networks, commonly used in small to medium-sized networks.

Concept tested: RFC 1918 private IP ranges

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

Topics

#RFC1918#Private IP addresses#IP addressing#Networking basics

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