Who owns MAC prefix 8C0551?

8C0551 is registered to Koubachi AG in the IEEE MA-L registry.

What devices use 8C0551?

Any network device with a MAC address starting 8C:05:51 was manufactured by or for Koubachi AG.

MA-L · OUI prefix

Koubachi AG

Any MAC address starting 8C:05:51 is registered to Koubachi AG in CH.

OUI prefix	8C0551
Vendor	Koubachi AG
Registry	MA-L (24-bit, large block)
Country	CH
Example MAC	8C:05:51:00:00:00

What this means

The IEEE assigned the MA-L block 8C0551 to Koubachi AG. 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 8C:05:51, it is Koubachi AG hardware.

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