A MAC address is comprised of six octets or in other words, six 8 bit long segments. The first three octets make up the <b>Organisationally Unique Identifier</b> (<b>OUI</b>), i.e., it can be used to identify the device's manufacturer. Refer to the figure below for a visual representation: | A MAC address is comprised of six octets or in other words, six 8 bit long segments. The first three octets make up the <b>Organisationally Unique Identifier</b> (<b>OUI</b>), i.e., it can be used to identify the device's manufacturer. Refer to the figure below for a visual representation: |