Who owns MAC prefix 70B3D52A3?

70B3D52A3 is registered to ATT Nussbaum Prüftechnik GmbH in the IEEE MA-S registry.

What devices use 70B3D52A3?

Any network device with a MAC address starting 70:B3:D5:2A:3 was manufactured by or for ATT Nussbaum Prüftechnik GmbH.

MA-S · OUI prefix

ATT Nussbaum Prüftechnik GmbH

Any MAC address starting 70:B3:D5:2A:3 is registered to ATT Nussbaum Prüftechnik GmbH in DE.

OUI prefix	70B3D52A3
Vendor	ATT Nussbaum Prüftechnik GmbH
Registry	MA-S (36-bit, small block)
Country	DE
Example MAC	70:B3:D5:2A:3:00:00:00

What this means

The IEEE assigned the MA-S block 70B3D52A3 to ATT Nussbaum Prüftechnik 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 70:B3:D5:2A:3, it is ATT Nussbaum Prüftechnik GmbH hardware.

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