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Dear Faisal,
Definition:
An Internet Protocol address (IP address) is a numerical label assigned to each device (e.g., computer, printer) participating in a computer network that uses the Internet Protocol for communication. An IP address serves two principal functions: host or network interface identification and location addressing. Its role has been characterized as follows: "A name indicates what we seek. An address indicates where it is. A route indicates how to get there."
The designers of the Internet Protocol defined an IP address as a32-bit number and this system, known as Internet Protocol Version4 (IPv4), is still in use today. However, due to the enormous growth of the Internet and the predicted depletion of available addresses, a new version of IP (IPv6), using128 bits for the address, was developed in1995. IPv6 was standardized as RFC2460 in1998, and its deployment has been ongoing since the mid-2000s.
Source: http://en.wikipedia.org/wiki/IP_address
IP Address Ranges:
A =0.0.0.0 -126.255.255.255
B =128.0.0.0 -191.255.255.255
C =192.0.0.0 -223.255.255.255
D =224.0.0.0 -239.255.255.255
E =240.0.0.0 -255.255.255.255
Private Start Ranges:
A =10.0.0.0 -10.255.255.255
B =172.16.0.0 -172.31.255.255
C =192.168.0.0 -192.168.255.255
IP Address Allocation by Countries:
