Who owns MAC prefix 80CEB1?

80CEB1 is registered to Theissen Training Systems GmbH in the IEEE MA-L registry.

What devices use 80CEB1?

Any network device with a MAC address starting 80:CE:B1 was manufactured by or for Theissen Training Systems GmbH.

MA-L · OUI prefix

Theissen Training Systems GmbH

Any MAC address starting 80:CE:B1 is registered to Theissen Training Systems GmbH in DE.

OUI prefix	80CEB1
Vendor	Theissen Training Systems GmbH
Registry	MA-L (24-bit, large block)
Country	DE
Example MAC	80:CE:B1:00:00:00

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.

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