What this means
The IEEE assigned the MA-L block 000B7B to Test-Um Inc.. 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 00:0B:7B, it is Test-Um Inc. hardware.
Frequently Asked Questions
Who owns MAC prefix 000B7B?
000B7B is registered to Test-Um Inc. 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. Test-Um Inc.'s block covers 16,777,216 addresses.
What devices use 000B7B?
Any network device with a MAC address starting 00:0B:7B was manufactured by or for Test-Um Inc..