Who owns MAC prefix 001D57?

001D57 is registered to CAETEC Messtechnik in the IEEE MA-L registry.

What devices use 001D57?

Any network device with a MAC address starting 00:1D:57 was manufactured by or for CAETEC Messtechnik.

MA-L · OUI prefix

CAETEC Messtechnik

Any MAC address starting 00:1D:57 is registered to CAETEC Messtechnik in DE.

OUI prefix	001D57
Vendor	CAETEC Messtechnik
Registry	MA-L (24-bit, large block)
Country	DE
Example MAC	00:1D:57:00:00:00

What this means

The IEEE assigned the MA-L block 001D57 to CAETEC Messtechnik. 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 00:1D:57, it is CAETEC Messtechnik hardware.

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