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Private and Reserved IP's

Because of the growing shortage of IP addresses, there is a special set of IP addresses that have been set aside by the Internet Assigned Numbers Authority (IANA) for private networks. These addresses should not be assigned to any system connected to the Internet.

There are three blocks of private IP addresses:

The first block is a single Class A network number, the second block is a set of 16 contiguous Class B network numbers, and the third block is a set of 255 contiguous Class C network numbers.




There are also IP addresses used for special purposes. The following are some IP's used for special purposes:

Address'sDescription
0.0.0.0 This address designates a default gateway. This is used in routing tables to represent "All Other Network Addresses".
127.0.0.1 This address is known as "loopback" or "localhost". All computers with a TCP/IP stack are assigned this address. This network address is used to simplify programming, testing, and troubleshooting. It allows applications to communicate with the local host in the same manner as communicating with a remote host, without the need to look up the local address.
224.0.0.0 - 239.255.255.255 Class D address block. These are reserved for multicast use.
240.0.0.0 - 254.255.255.255 Class E address block. These are reserved.
255.255.255.255 This address broadcasts to the local subnets.