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Difficulty: MediumPrivate IPv4 Addressing and RFC 1918

During a security compliance audit of internal corporate subnets, a network engineer is asked to verify that host interfaces use IPv4 addresses from the Class B private space defined in RFC 1918. Which of the following IPv4 addresses falls strictly within the valid RFC 1918 Class B private address range?

  1. 172.31.200.15Answer
  2. B
    172.32.10.5
  3. C
    192.169.50.1
  4. D
    11.1.1.100

Answer

The address 172.31.200.15 is the only valid RFC 1918 Class B private IPv4 address among the choices.
The IPv4 address 172.31.200.15 resides within the 172.16.0.0/12 block reserved by RFC 1918, which spans from 172.16.0.0 through 172.31.255.255.

Step-by-Step Solution

1
Recall the RFC 1918 private IPv4 address ranges.
Class A: 10.0.0.0 to 10.255.255.255 (10.0.0.0/8); Class B: 172.16.0.0 to 172.31.255.255 (172.16.0.0/12); Class C: 192.168.0.0 to 192.168.255.255 (192.168.0.0/16).
Identifying the official range boundaries is necessary to differentiate private space from public space.
2
Evaluate each provided option against the Class B RFC 1918 boundaries.
172.31.200.15 is between 172.16.0.0 and 172.31.255.255, making it a private RFC 1918 address.
The second octet of 31 is the upper boundary of the /12 block.

Key Concept

RFC 1918 Private IPv4 Address Ranges
Estimated Time:1m 0s
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Topics

Private IPv4 Addressing and RFC 1918

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