What this means
The IEEE assigned the MA-L block 001B5E to BPL Limited. 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 00:1B:5E, it is BPL Limited hardware.
Frequently Asked Questions
Who owns MAC prefix 001B5E?
001B5E is registered to BPL Limited 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. BPL Limited's block covers 16,777,216 addresses.
What devices use 001B5E?
Any network device with a MAC address starting 00:1B:5E was manufactured by or for BPL Limited.