Who owns MAC prefix 001B66?

001B66 is registered to Sennheiser electronic GmbH & Co. KG in the IEEE MA-L registry.

What devices use 001B66?

Any network device with a MAC address starting 00:1B:66 was manufactured by or for Sennheiser electronic GmbH & Co. KG.

MA-L · OUI prefix

Sennheiser electronic GmbH & Co. KG

Any MAC address starting 00:1B:66 is registered to Sennheiser electronic GmbH & Co. KG in DE.

OUI prefix	001B66
Vendor	Sennheiser electronic GmbH & Co. KG
Registry	MA-L (24-bit, large block)
Country	DE
Example MAC	00:1B:66:00:00:00

What this means

The IEEE assigned the MA-L block 001B66 to Sennheiser electronic GmbH & Co. KG. 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:66, it is Sennheiser electronic GmbH & Co. KG hardware.

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