Who owns MAC prefix D057A1?

D057A1 is registered to Werma Signaltechnik GmbH & Co. KG in the IEEE MA-L registry.

What devices use D057A1?

Any network device with a MAC address starting D0:57:A1 was manufactured by or for Werma Signaltechnik GmbH & Co. KG.

MA-L · OUI prefix

Werma Signaltechnik GmbH & Co. KG

Any MAC address starting D0:57:A1 is registered to Werma Signaltechnik GmbH & Co. KG in DE.

OUI prefix	D057A1
Vendor	Werma Signaltechnik GmbH & Co. KG
Registry	MA-L (24-bit, large block)
Country	DE
Example MAC	D0:57:A1:00:00:00

What this means

The IEEE assigned the MA-L block D057A1 to Werma Signaltechnik 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 D0:57:A1, it is Werma Signaltechnik GmbH & Co. KG hardware.

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