fünfeinhalb Funksysteme GmbH

Any device whose MAC address begins with B4:E8:5C has a network interface built by fünfeinhalb Funksysteme 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:E8:5C

Organization

fünfeinhalb Funksysteme GmbH

Address

Chemnitzer Straße 78A Dresden Saxony DE 01187

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.