What this means
The IEEE assigned the MA-L block B8B1C7 to BT&COM 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 B8:B1:C7, it is BT&COM CO.,LTD hardware.
Frequently Asked Questions
Who owns MAC prefix B8B1C7?
B8B1C7 is registered to BT&COM 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. BT&COM CO.,LTD's block covers 16,777,216 addresses.
What devices use B8B1C7?
Any network device with a MAC address starting B8:B1:C7 was manufactured by or for BT&COM CO.,LTD.