Wilk Elektronik S.A.

Any device whose MAC address begins with A4:5D:5E has a network interface built by Wilk Elektronik S.A.. This prefix (the OUI, or Organizationally Unique Identifier) is assigned by the IEEE and is the first three octets of the address.

OUI prefix

A4:5D:5E

Organization

Wilk Elektronik S.A.

Address

Mikolowska 42 Laziska Gorne Slaskie PL 43-173

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.