Proximus

Any device whose MAC address begins with 54:D7:51 has a network interface built by Proximus. This prefix (the OUI, or Organizationally Unique Identifier) is assigned by the IEEE and is the first three octets of the address.

OUI prefix

54:D7:51

Organization

Proximus

Address

Bld du Roi Albert II 27 Brussels BE 1030

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.