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Computer Networking Basics

Which of the following IPv4 addresses falls within a private address range?

  1. A172.32.0.1
  2. B192.168.100.1
  3. C11.1.1.1
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Answer: B. 192.168.100.1

The private address ranges defined in RFC 1918 are 10.0.0.0/8, 172.16.0.0/12 (172.16.0.0 to 172.31.255.255) and 192.168.0.0/16. They can be used freely inside organizations and homes, and because no routes for them are advertised on the internet, many organizations can reuse the same addresses. To communicate with the internet, a router's NAT translates them to global addresses. 172.32.0.1 has a second octet outside 16–31, so it is not in 172.16.0.0/12, and 11.1.1.1 is outside 10.0.0.0/8.

  • A. 172.16.0.0/12 ends at 172.31.255.255, so 172.32 is not included.
  • B. Correct. It is within 192.168.0.0/16.
  • C. The private range is 10.0.0.0/8; addresses starting with 11 are not included.
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