Answer Posted / sreevani
An identifier for a computer or device on a TCP/IP network.
Networks using the TCP/IP protocol route messages based on
the IP address of the destination. The format of an IP
address is a 32-bit numeric address written as four numbers
separated by periods. Each number can be zero to 255. For
example, 1.160.10.240 could be an IP address.
Within an isolated network, you can assign IP addresses at
random as long as each one is unique. However, connecting a
private network to the Internet requires using registered
IP addresses (called Internet addresses) to avoid
duplicates.
The four numbers in an IP address are used in different
ways to identify a particular network and a host on that
network. Four regional Internet registries -- ARIN, RIPE
NCC, LACNIC and APNIC -- assign Internet addresses from the
following three classes.
Class A - supports 16 million hosts on each of 126 networks
Class B - supports 65,000 hosts on each of 16,000 networks
Class C - supports 254 hosts on each of 2 million networks
The number of unassigned Internet addresses is running out,
so a new classless scheme called CIDR is gradually
replacing the system based on classes A, B, and C and is
tied to adoption of IPv6.
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