Bryston Ltd.

Any device whose MAC address begins with 04:6D:42 has a network interface built by Bryston Ltd.. This prefix (the OUI, or Organizationally Unique Identifier) is assigned by the IEEE and is the first three octets of the address.

OUI prefix

04:6D:42

Organization

Bryston Ltd.

Address

P.O. Box 2170 Peterborough Ontario CA K9J 7Y4

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.