What this means
The IEEE assigned the MA-L block 000CAC to Citizen Watch Co., Ltd.. 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 00:0C:AC, it is Citizen Watch Co., Ltd. hardware.
Frequently Asked Questions
Who owns MAC prefix 000CAC?
000CAC is registered to Citizen Watch Co., Ltd. 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. Citizen Watch Co., Ltd.'s block covers 16,777,216 addresses.
What devices use 000CAC?
Any network device with a MAC address starting 00:0C:AC was manufactured by or for Citizen Watch Co., Ltd..