GMC Guardian Mobility Corp.

Any device whose MAC address begins with 00:19:3D has a network interface built by GMC Guardian Mobility Corp.. This prefix (the OUI, or Organizationally Unique Identifier) is assigned by the IEEE and is the first three octets of the address.

OUI prefix

00:19:3D

Organization

GMC Guardian Mobility Corp.

Address

Suite 200 Ottawa ON CA K2E 7Y8

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.