What this means
The IEEE assigned the MA-L block 001B05 to YMC AG. 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 00:1B:05, it is YMC AG hardware.
Frequently Asked Questions
Who owns MAC prefix 001B05?
001B05 is registered to YMC AG 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. YMC AG's block covers 16,777,216 addresses.
What devices use 001B05?
Any network device with a MAC address starting 00:1B:05 was manufactured by or for YMC AG.