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Difficulty: EasyPrivate IPv4 Addressing and RFC 1918

An administrator is configuring an internal workstation and needs to manually assign an IPv4 address that belongs to an RFC 1918 private network block. Which IPv4 address is valid for this requirement?

  1. 172.25.100.50Answer
  2. B
    172.33.100.50
  3. C
    192.169.50.1
  4. D
    11.0.0.50

Answer

172.25.100.50 is a valid RFC 1918 private IPv4 address.
The address 172.25.100.50 is correct because RFC 1918 specifies 172.16.0.0/12 (covering 172.16.0.0 through 172.31.255.255) as a private IPv4 block. Because 25 is between 16 and 31 in the second octet, 172.25.100.50 is a valid private IPv4 address.

Step-by-Step Solution

1
Identify the designated RFC 1918 private IPv4 address ranges.
The defined private ranges are 10.0.0.0/8 (10.0.0.0 - 10.255.255.255), 172.16.0.0/12 (172.16.0.0 - 172.31.255.255), and 192.168.0.0/16 (192.168.0.0 - 192.168.255.255).
RFC 1918 reserves specific IP address blocks for private internal networks that are not routable on the public Internet.
2
Evaluate the given address options against the RFC 1918 ranges.
172.25.100.50 falls between 172.16.0.0 and 172.31.255.255, making it a valid private address. The addresses starting with 172.33, 192.169, and 11 are public addresses.
Only IP addresses within the exact start and end boundaries of RFC 1918 blocks are reserved for private use.

Key Concept

RFC 1918 Private IPv4 Address Ranges
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Topics

Private IPv4 Addressing and RFC 1918

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