A Media Access Control (MAC) is a globally unique id assigned to a network device. It is physically 'engraved' into the network device by the manufacturer and is often called the hardware or physical address. It consists of 6 bytes which is 48 bits (6 * 8 = 48).
A media access control address (MAC address) of a device is a unique identifier assigned to network interfaces for communications at the data link layer of a network segment. MAC addresses are used as a network address for most IEEE 802 network technologies, including Ethernet and Wi-Fi. Logically, MAC addresses are used in the media access control protocol sublayer of the OSI reference model.
MAC addresses are most often assigned by the manufacturer of a network …