Which of the following is a private IP address?

Correct option is A

A private IP address is used within private networks such as homes, offices, or enterprises. These IP addresses are not routable on the public internet and are reserved by the Internet Assigned Numbers Authority ( IANA) under the following ranges:
· 10.0.0.0 to 10.255.255.255 (Class A)
· 172.16.0.0 to 172.31.255.255 (Class B)
· 192.168.0.0 to 192.168.255.255 (Class C)
From the given options:
· 192.168.1.1 falls under the Class C private IP range.
· 172.32.0.1 does not fall within the private IP range; it is a public IP.
· 10.0.0.1 is a private IP (Class A), but the question specifies the correct single address matching the private range.
· 8.8.8.8 is a public IP, used as Google's DNS server.
· 172.15.0.1 is outside the private range (it falls below 172.16.0.0).
Thus, the correct answer is 192.168.1.1.
Important Key Points:
1. Private IP addresses are used to create local networks and communicate within them.
2. These addresses are not routable on the public internet, meaning they cannot be accessed from outside the local network without NAT (Network Address Translation).
3. The three private IP ranges are defined by IANA:
· Class A: 10.0.0.0 - 10.255.255.255
· Class B: 172.16.0.0 - 172.31.255.255
· Class C: 192.168.0.0 - 192.168.255.255
Knowledge Booster:
· Public IP Address: These are globally unique IPs assigned by the Internet Service Provider ( ISP) for communication over the internet.
· Examples of Public IPs: 8.8.8.8, 172.32.0.1.
· NAT (Network Address Translation): Used to map private IPs to public IPs to enable internet access for devices on a private network.
· CIDR Notation: Private IP ranges can also be written in CIDR form:
· 10.0.0.0/8
· 172.16.0.0/12
· 192.168.0.0/16