Private IP address and Public IP address

A private network is a network that uses private IP address space. These are the addresses are commonly used for home, office and enterprise local area networks (LANs).

Private IP addresses

10.0.0.0 - 10.255.255.255

Addresses: 16,777,216

172.16.0.0 - 172.31.2555.255

Addresses: 1.048,576

192.168.0.0 - 192.168.255.255

Address: 65,536

Public IP addresses is what seen by the world, such as web servers.  A public IP addesss is synonymous with a globally routable unicast IP address. Public IP addresses are those that allow any two computers to identify each other.   

Public IP addresses

Class A: 1.0.0.0 to 126.0.0.0

Class B: 128.0.0.0 to 191.0.0.0

Class C: 192.0.0.0 to 223.0.0.0

Class D: 224.0.0.0 to 239.0.0.0 (Multicast)

Class E: 240.0.0.0 to 255.0.0.0 (For research)