Question

Which of the following is NOT a private network number?

a. 10.1.3.6

b. 172.16.3.2

c. 192.168.221.7

d. 221.15.123.14

Answer 1

The IP address 221.15.123.14 is not a private network number because it does not fall within the specific IP ranges designated for private networks, which are 10.x.x.x, 172.16.x.x to 172.31.x.x, and 192.168.x.x.

Step-by-step explanation:

The answer to which of the following is NOT a private network number is d. 221.15.123.14. The IP addresses that are considered private (not routable on the internet) come from specific ranges:

• 10.0.0.0 to 10.255.255.255
• 172.16.0.0 to 172.31.255.255
• 192.168.0.0 to 192.168.255.255

These ranges are defined by the Internet Assigned Numbers Authority (IANA) and are used within private networks. Option d, with the IP address 221.15.123.14, does not fall within these private IP ranges, therefore it is NOT a private network number.