Definition: MAC technology provides unique identification and access control for computers on an Internet Protocol (IP) network. In wireless networking, MAC is the radio control protocol on the wireless network adapter. MAC works at the lower sub layer of the data link layer (Layer 2) of the OSI model.
MAC assigns a unique number to each IP network adapter called the MAC address. A MAC address is 48 bits long. The MAC address is commonly written as a sequence of 12 hexadecimal digits. MAC addresses are uniquely set by the network adapter manufacturer and are sometimes called “physical addresses” for this reason. The first six hexadecimal digits of the address correspond to a manufacturer’s unique identifier, while the last six digits correspond to the device’s serial number. MAC addresses map to logical IP addresses through the Address Resolution Protocol (ARP).