Wi-Fi Alliance

Any device whose MAC address begins with D4:5C:70 has a network interface built by Wi-Fi Alliance. This prefix (the OUI, or Organizationally Unique Identifier) is assigned by the IEEE and is the first three octets of the address.

OUI prefix

D4:5C:70

Organization

Wi-Fi Alliance

Address

10900-B Stonelake Boulevard Austin TX US 78759

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.