What this means
The IEEE assigned the MA-L block 80CEB1 to Theissen Training Systems 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 80:CE:B1, it is Theissen Training Systems GmbH hardware.
Frequently Asked Questions
Who owns MAC prefix 80CEB1?
80CEB1 is registered to Theissen Training Systems 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. Theissen Training Systems GmbH's block covers 16,777,216 addresses.
What devices use 80CEB1?
Any network device with a MAC address starting 80:CE:B1 was manufactured by or for Theissen Training Systems GmbH.