Who owns MAC prefix 204005?

204005 is registered to feno GmbH in the IEEE MA-L registry.

What devices use 204005?

Any network device with a MAC address starting 20:40:05 was manufactured by or for feno GmbH.

MA-L · OUI prefix

feno GmbH

Any MAC address starting 20:40:05 is registered to feno GmbH in DE.

OUI prefix	204005
Vendor	feno GmbH
Registry	MA-L (24-bit, large block)
Country	DE
Example MAC	20:40:05:00:00:00

What this means

The IEEE assigned the MA-L block 204005 to feno 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 20:40:05, it is feno GmbH hardware.

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