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.
Frequently Asked Questions
Who owns MAC prefix D057A1?
D057A1 is registered to Werma Signaltechnik GmbH & Co. KG in the IEEE MA-L registry.
What does the MA-L registry type mean?
An MA-L assignment, the IEEE's original OUI format, gives the vendor the first three octets and 16,777,216 device addresses under them. Werma Signaltechnik GmbH & Co. KG's block covers 16,777,216 addresses.
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.