220-801 · Question #406
Which of the following is a private class B IP address?
The correct answer is B. 172.16.0.1. The private Class B IP address range is 172.16.0.0 through 172.31.255.255 as defined by RFC 1918, and 172.16.0.1 falls within this range.
Question
Which of the following is a private class B IP address?
Options
- A10.0.15.1
- B172.16.0.1
- C172.33.1.1
- D192.168.1.1
How the community answered
(43 responses)- A2% (1)
- B91% (39)
- C2% (1)
- D5% (2)
Why each option
The private Class B IP address range is 172.16.0.0 through 172.31.255.255 as defined by RFC 1918, and 172.16.0.1 falls within this range.
10.0.15.1 falls within the private Class A range (10.0.0.0 to 10.255.255.255), not Class B.
RFC 1918 defines three private IP address ranges. The Class B private range is 172.16.0.0 to 172.31.255.255. The address 172.16.0.1 falls within this range, making it a valid private Class B address used for internal networks that are not directly routable on the public internet.
172.33.1.1 falls outside the private Class B range (which ends at 172.31.255.255) and is therefore a public IP address.
192.168.1.1 falls within the private Class C range (192.168.0.0 to 192.168.255.255), not Class B.
Concept tested: RFC 1918 private IP address ranges and classes
Source: https://www.rfc-editor.org/rfc/rfc1918
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