Grasphere Japan

Any device whose MAC address begins with 04:19:7F has a network interface built by Grasphere Japan. This prefix (the OUI, or Organizationally Unique Identifier) is assigned by the IEEE and is the first three octets of the address.

OUI prefix

04:19:7F

Organization

Grasphere Japan

Address

3-1-11 NNT build. Tokyo JP 1030013

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.