What this means
The IEEE assigned the MA-L block 00C004 to JAPAN BUSINESS COMPUTER 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:C0:04, it is JAPAN BUSINESS COMPUTER CO.LTD hardware.
Frequently Asked Questions
Who owns MAC prefix 00C004?
00C004 is registered to JAPAN BUSINESS COMPUTER 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. JAPAN BUSINESS COMPUTER CO.LTD's block covers 16,777,216 addresses.
What devices use 00C004?
Any network device with a MAC address starting 00:C0:04 was manufactured by or for JAPAN BUSINESS COMPUTER CO.LTD.