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IP Chart - Basics



The key to understanding IP is knowing what a routing table looks like.

IP addresses are 32 bit numbers and are represented in a dotted decimal notation:


Each decimal number represents eight bits of binary data, and therefore can have a decimal value between 0 and 255:    to

It is the value of the first number of the IP address that determines the class to which a given IP address belongs.  IP addresses most commonly are class A, B, or C.

Class Range Allocation
A 1-126 N.H.H.H
(A) 127 (loopback)
B 128-191 N.N.H.H
C 192-223 N.N.N.H
D 224-239 (multi-cast)
E 240-248 reserved

N=Network  H=Host

Notes: is a class A network, but is reserved for use as a loopback address (typically

The network is reserved for use as the default route.

Class D addresses are used by groups of hosts or routers that share common characteristics.

Class D addresses are used for multi-cast applications.

Class E addresses exist (240-248) but are reserved for future use.

RFC 790 - Assigned numbers

How the world finds us:  A9 - AltaVista - AOL - Ask - Clusty - Excite - Gigablast - Google - HotBot - Lycos - MSN - Wisenut - Yahoo

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