What this means
The IEEE assigned the MA-L block 00120F to IEEE 802.3 Working Group. Every network interface they manufacture under this block has a MAC address beginning with these digits, followed by a unique per-device identifier. If a device on your network shows a MAC starting 00:12:0F, it is IEEE 802.3 Working Group hardware.
Frequently Asked Questions
Who owns MAC prefix 00120F?
00120F is registered to IEEE 802.3 Working Group in the IEEE MA-L registry.
What does the MA-L registry type mean?
An MA-L assignment, the IEEE's original OUI format, gives the vendor the first three octets and 16,777,216 device addresses under them. IEEE 802.3 Working Group's block covers 16,777,216 addresses.
What devices use 00120F?
Any network device with a MAC address starting 00:12:0F was manufactured by or for IEEE 802.3 Working Group.