ACX GmbH

Any device whose MAC address begins with 70:31:87 has a network interface built by ACX GmbH. This prefix (the OUI, or Organizationally Unique Identifier) is assigned by the IEEE and is the first three octets of the address.

OUI prefix

70:31:87

Organization

ACX GmbH

Address

Äußere Zwickauer Straße 8 Zwickau DE 08064

Source

IEEE OUI registry

Have a full MAC address? Look it up— we'll also tell you if it's a randomized (private) address rather than a real manufacturer prefix.