220-801 · Question #543
Which of the following is a public IP address?
The correct answer is B. 62.10.1.1. 62.10.1.1 is a public IP address because it falls outside all three private IPv4 address ranges defined by RFC 1918.
Question
Which of the following is a public IP address?
Options
- A10.0.0.1
- B62.10.1.1
- C172.16.0.1
- D192.168.1.1
How the community answered
(44 responses)- A7% (3)
- B86% (38)
- C2% (1)
- D5% (2)
Why each option
62.10.1.1 is a public IP address because it falls outside all three private IPv4 address ranges defined by RFC 1918.
10.0.0.1 falls within the 10.0.0.0/8 private range (10.0.0.0 - 10.255.255.255) defined in RFC 1918 and is not routable on the public internet.
62.10.1.1 does not fall within any of the three RFC 1918 private address ranges (10.0.0.0/8, 172.16.0.0/12, or 192.168.0.0/16), making it a publicly routable IP address assigned and managed by the regional internet registry (RIR) system. Public IPs are globally unique and reachable across the internet.
172.16.0.1 falls within the 172.16.0.0/12 private range (172.16.0.0 - 172.31.255.255) defined in RFC 1918 and is not publicly routable.
192.168.1.1 falls within the 192.168.0.0/16 private range (192.168.0.0 - 192.168.255.255) defined in RFC 1918 and is the most commonly recognized private IP range.
Concept tested: RFC 1918 private vs public IPv4 address ranges
Source: https://www.rfc-editor.org/rfc/rfc1918
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