What this means
The IEEE assigned the MA-L block 00077F to J Communications 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 00:07:7F, it is J Communications Co., Ltd. hardware.
Frequently Asked Questions
Who owns MAC prefix 00077F?
00077F is registered to J Communications 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. J Communications Co., Ltd.'s block covers 16,777,216 addresses.
What devices use 00077F?
Any network device with a MAC address starting 00:07:7F was manufactured by or for J Communications Co., Ltd..