Which of the following is a private IP address?

Which of the following is a private IP address?

• A. 172.16.4.4
• B. 8.8.8.8
• C. 1.1.1.1
• D. 198.51.100.7

Answer: (A)

Private IP addresses are numbers reserved for use inside local networks and are not meant to be reachable on the public internet. The ranges designated for private use are 10.0.0.0/8, 172.16.0.0/12, and 192.168.0.0/16. The address 172.16.4.4 sits inside 172.16.0.0 to 172.31.255.255, so it is a private address. The other addresses are publicly routable or reserved for documentation, not private networking: 8.8.8.8 and 1.1.1.1 are public DNS addresses, and 198.51.100.7 is part of a block set aside for documentation/examples. In a private network behind NAT, devices can use addresses like 172.16.4.4 while the router translates to a public IP for internet access.

Private IP addresses are numbers reserved for use inside local networks and are not meant to be reachable on the public internet. The ranges designated for private use are 10.0.0.0/8, 172.16.0.0/12, and 192.168.0.0/16. The address 172.16.4.4 sits inside 172.16.0.0 to 172.31.255.255, so it is a private address. The other addresses are publicly routable or reserved for documentation, not private networking: 8.8.8.8 and 1.1.1.1 are public DNS addresses, and 198.51.100.7 is part of a block set aside for documentation/examples. In a private network behind NAT, devices can use addresses like 172.16.4.4 while the router translates to a public IP for internet access.