Media Access Control (MAC) address, which is a 6-byte (48-bit) binary address written in hexadecimal notation (for example, 00-13-02-1F-58-F5). The first 3 bytes (24 bits) of the address denote the vendor or manufacturer of the physical network interface. This is known as the Organizationally Unique Identifier (OUI). OUIs are registered with the Institute of Electrical and Electronics Engineers (IEEE), which controls their issuance.
