IP address

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Description

An IP address is a set of numbers that identify your computer on a network. IPV4, the traditional numbering scheme, uses four integers ranging from zero to 255 and set apart by periods. For example, "204.120.0.15" is a valid IPV4 address. A newer IPV6 scheme, designed to eventually replace IPV4, uses a larger, more complex set of numbers mixed with other characters, such as letters.

Reserved Addresses

Networks set aside certain combinations for housekeeping and testing, such as the extreme values, "0.0.0.0" and "255.255.255.255." Another number, "127.0.0.1" is called the "localhost;" every computer on a network refers to itself as this address. Because these numbers have special meanings, the network does not assign them to PCs; such addresses would be invalid.

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