Madge Ltd.

Any device whose MAC address begins with 00:00:C1 has a network interface built by Madge 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

00:00:C1

Organization

Madge Ltd.

Address

Madge House Maindenhead Berkshire GB SL6 2HP

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.