#computernetwork, #privateipaddress

Question

private ip address like 

 Class A, Private IP Address: 10.0.0.0 to 10.255.255.255

 Class B, Private IP Address: 172.16.0.0 to 172.31.255.255

 Class C, Private IP Address: 192.168.0.0 to 192.168.255.255

 

why not use this private ip address?, please explain in brief…

thanks you !

Answer 1

Class A has 8 bit network ID bits & 24 bit host ID bits.

Class B has 16 bit network ID bits & 16 bit host ID bits.

Class C has 24 bit network ID bits & 8 bit host ID bits.

So, in above examples according to their classes the host ID bits of all addresses are set 0 which represents the Network ID of entire network also set to 1 which represents direct broadcast of the network .

That’s why these addresses are not used.

Answer 2

• Private IP addresses, as defined in the ranges you mentioned, are reserved for internal use within private networks and are not routable on the public internet. They are used to provide a way for devices within a local network to communicate with each other without conflicting with public IP addresses that are used on the global internet. Here are some reasons why private IP addresses are used:

1. Address Space Conservation: The IPv4 address space is limited, and private IP addresses help conserve public IP addresses. By using private IP addresses within local networks, organizations can have many devices connected without the need for a unique public IP address for each device.

2. Security and Isolation: Private IP addresses provide a level of security by isolating internal network devices from the external internet. Devices with private IP addresses cannot be directly accessed from the internet, reducing the risk of unauthorized access and potential security threats.

3. Intranet and Local Communication: Private IP addresses are ideal for creating intranets or local area networks (LANs). They allow devices within an organization's network to communicate efficiently without exposing them to the complexities and security risks of the public internet.

4. IPv4 Address Exhaustion: The public IPv4 address space has been exhausted, and the transition to IPv6 is ongoing. Private IP addresses offer a temporary solution to extend the life of IPv4 until a full transition to IPv6 is achieved.

5. Cost Savings: Using private IP addresses can save costs for organizations that have a large number of devices by reducing the need for purchasing additional public IP addresses.