What this means
The IEEE assigned the MA-L block 0003BB to Signal Communications 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 00:03:BB, it is Signal Communications Limited hardware.
Frequently Asked Questions
Who owns MAC prefix 0003BB?
0003BB is registered to Signal Communications 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. Signal Communications Limited's block covers 16,777,216 addresses.
What devices use 0003BB?
Any network device with a MAC address starting 00:03:BB was manufactured by or for Signal Communications Limited.