Who owns MAC prefix 581CBD?

581CBD is registered to Affinegy in the IEEE MA-L registry.

What devices use 581CBD?

Any network device with a MAC address starting 58:1C:BD was manufactured by or for Affinegy.

MA-L · OUI prefix

Affinegy

Any MAC address starting 58:1C:BD is registered to Affinegy in US.

OUI prefix	581CBD
Vendor	Affinegy
Registry	MA-L (24-bit, large block)
Country	US
Example MAC	58:1C:BD:00:00:00

What this means

The IEEE assigned the MA-L block 581CBD to Affinegy. 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 58:1C:BD, it is Affinegy hardware.

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