What this means
The IEEE assigned the MA-L block 0000DB to British Telecommunications plc. 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 00:00:DB, it is British Telecommunications plc hardware.
Frequently Asked Questions
Who owns MAC prefix 0000DB?
0000DB is registered to British Telecommunications plc 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. British Telecommunications plc's block covers 16,777,216 addresses.
What devices use 0000DB?
Any network device with a MAC address starting 00:00:DB was manufactured by or for British Telecommunications plc.