Dog Hunter LLC

Any device whose MAC address begins with B4:21:8A has a network interface built by Dog Hunter LLC. This prefix (the OUI, or Organizationally Unique Identifier) is assigned by the IEEE and is the first three octets of the address.

OUI prefix

B4:21:8A

Organization

Dog Hunter LLC

Address

8 Faneuil Hall SQ Boston MA US 02109

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.