What this means
The IEEE assigned the MA-L block 001B99 to KS System GmbH. 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:99, it is KS System GmbH hardware.
Frequently Asked Questions
Who owns MAC prefix 001B99?
001B99 is registered to KS System GmbH 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. KS System GmbH's block covers 16,777,216 addresses.
What devices use 001B99?
Any network device with a MAC address starting 00:1B:99 was manufactured by or for KS System GmbH.