Amptown System Company GmbH

Any device whose MAC address begins with B4:85:47 has a network interface built by Amptown System Company 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

B4:85:47

Organization

Amptown System Company GmbH

Address

Wandsbeker Strasse 26 Hamburg Hamburg DE 22179

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.