What this means
The IEEE assigned the MA-L block 0005B1 to ASB Technology BV. 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 00:05:B1, it is ASB Technology BV hardware.
Frequently Asked Questions
Who owns MAC prefix 0005B1?
0005B1 is registered to ASB Technology BV 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. ASB Technology BV's block covers 16,777,216 addresses.
What devices use 0005B1?
Any network device with a MAC address starting 00:05:B1 was manufactured by or for ASB Technology BV.