Widex A/S

Any device whose MAC address begins with 40:4A:D4 has a network interface built by Widex A/S. This prefix (the OUI, or Organizationally Unique Identifier) is assigned by the IEEE and is the first three octets of the address.

OUI prefix

40:4A:D4

Organization

Widex A/S

Address

Nymoellevej 6 Lynge Alleroed DK DK3540

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.