Private IP Address
Current Internet Protocol widely use is IP version 4. This IPv4 in short term, allocate 32 bit address, so there’re maximum 2^32 = 4.294.967.296 IP addresses in the Internet. Big number but seems will not enough 🙂
IPv6 has bigger address space, 128 bit, so we will have 2^128 = 340.282.366.920.938.463.463.374.607.431.768.211.456 IP addresses in the internet, very big number :D.
However, IPv6 is not widely deployed now, some solution already proposed to minimize the address space limitation problem on IPv4, one of them is IP private. RFC 1918 defines IP private which should not used on public internet:
10.0.0.0 - 10.255.255.255 (10/8 prefix) 172.16.0.0 - 172.31.255.255 (172.16/12 prefix) 192.168.0.0 - 192.168.255.255 (192.168/16 prefix)
Normally we will use this address on our home or office and we will able to access internet either using proxy or NAT/IP Masquerade solution.