What this means
The IEEE assigned the MA-L block 001191 to CTS-Clima Temperatur Systeme 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 00:11:91, it is CTS-Clima Temperatur Systeme GmbH hardware.
Frequently Asked Questions
Who owns MAC prefix 001191?
001191 is registered to CTS-Clima Temperatur Systeme 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. CTS-Clima Temperatur Systeme GmbH's block covers 16,777,216 addresses.
What devices use 001191?
Any network device with a MAC address starting 00:11:91 was manufactured by or for CTS-Clima Temperatur Systeme GmbH.