The MAC address uniquely identifies each node in a network. It takes the form of six pairs of hexadecimal digits (0 to 9 and letters A to F) that are separated by colons or dashes and usually appear like this: 00:50:56:C0:00:01.
The MAC address is usually associated with a network adapter or a device with networking capability; for this reason, it's frequently called the physical address.
The first three pairs of digits in the MAC address are called the organizational unique identifier, and they serve to identify the company that manufactured or sold the device. The last three pairs of digits are specific to the device and can be considered to be a serial number.
Because a MAC address is unique, it can be used to associate a user to a particular network, especially a wireless network. This has two significant implications...
