Napco Security Technologies

Any device whose MAC address begins with D4:F0:B4 has a network interface built by Napco Security Technologies. 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:F0:B4

Organization

Napco Security Technologies

Address

333 Bayview Ave Amityville NY US 11701

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.