MAC may refer to any of the following:
1. Short for Medium Access Control, or MAC address. Known as a physical address and hardware address whose number is uniquely formatted in hexadecimal format and given to each computer or network device on a computer network. The addresses are usually assigned by the hardware manufacturer, and these ID's are considered burned into the firmware of the network access hardware. Because of this process, some vendors use their own specific code in the hardware address. Below is an example of a MAC address.
Because a MAC address is a unique address, a computer network will not have the same MAC address assigned to more than one computer or network device.