What this means
The IEEE assigned the MA-L block 0001B1 to General Bandwidth. 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 00:01:B1, it is General Bandwidth hardware.
Frequently Asked Questions
Who owns MAC prefix 0001B1?
0001B1 is registered to General Bandwidth 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. General Bandwidth's block covers 16,777,216 addresses.
What devices use 0001B1?
Any network device with a MAC address starting 00:01:B1 was manufactured by or for General Bandwidth.