Russound

Any device whose MAC address begins with 00:21:C7 has a network interface built by Russound. This prefix (the OUI, or Organizationally Unique Identifier) is assigned by the IEEE and is the first three octets of the address.

OUI prefix

00:21:C7

Organization

Russound

Address

5 Forbes Road Newmarket NH US 03857

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.