An IP address or IP number is a unique number that's used by the Internet protocol (IP) to identify a computer or "host" that is connected to the Internet. The present version of the IP address, IPv4 (IP version 4) is containing a 32-bit value that is limiting the total number of addresses to approximately 2 billions. In the coming IP version 6, IPv6, the IP number consists of 128 bits which will increase the number of IP addresses to a gigantic quantity.