ActivNetworks

Any device whose MAC address begins with 00:12:03 has a network interface built by ActivNetworks. This prefix (the OUI, or Organizationally Unique Identifier) is assigned by the IEEE and is the first three octets of the address.

OUI prefix

00:12:03

Organization

ActivNetworks

Address

BAT L - 1 rue de Terre Neuve COURTABOEUF FR 91944

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.