IBT Ingenieurbureau Broennimann Thun

Any device whose MAC address begins with D4:52:51 has a network interface built by IBT Ingenieurbureau Broennimann Thun. This prefix (the OUI, or Organizationally Unique Identifier) is assigned by the IEEE and is the first three octets of the address.

OUI prefix

D4:52:51

Organization

IBT Ingenieurbureau Broennimann Thun

Address

Kasernenstrasse 5 Thun Bern CH 3600

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.