What this means
The IEEE assigned the MA-L block 00123B to KeRo Systems ApS. 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 00:12:3B, it is KeRo Systems ApS hardware.
Frequently Asked Questions
Who owns MAC prefix 00123B?
00123B is registered to KeRo Systems ApS 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. KeRo Systems ApS's block covers 16,777,216 addresses.
What devices use 00123B?
Any network device with a MAC address starting 00:12:3B was manufactured by or for KeRo Systems ApS.