What this means
The IEEE assigned the MA-L block B48931 to Silicon Laboratories. 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 B4:89:31, it is Silicon Laboratories hardware.
Frequently Asked Questions
Who owns MAC prefix B48931?
B48931 is registered to Silicon Laboratories 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. Silicon Laboratories's block covers 16,777,216 addresses.
What devices use B48931?
Any network device with a MAC address starting B4:89:31 was manufactured by or for Silicon Laboratories.