What this means
The IEEE assigned the MA-L block 0012B7 to PTW Freiburg. 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:B7, it is PTW Freiburg hardware.
Frequently Asked Questions
Who owns MAC prefix 0012B7?
0012B7 is registered to PTW Freiburg 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. PTW Freiburg's block covers 16,777,216 addresses.
What devices use 0012B7?
Any network device with a MAC address starting 00:12:B7 was manufactured by or for PTW Freiburg.