What this means
The IEEE assigned the MA-L block B456F3 to Westermo Network Technologies AB. 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 B4:56:F3, it is Westermo Network Technologies AB hardware.
Frequently Asked Questions
Who owns MAC prefix B456F3?
B456F3 is registered to Westermo Network Technologies AB 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. Westermo Network Technologies AB's block covers 16,777,216 addresses.
What devices use B456F3?
Any network device with a MAC address starting B4:56:F3 was manufactured by or for Westermo Network Technologies AB.