e-trees Japan, Inc.

Any device whose MAC address begins with 00:1B:1A has a network interface built by e-trees Japan, Inc.. This prefix (the OUI, or Organizationally Unique Identifier) is assigned by the IEEE and is the first three octets of the address.

OUI prefix

00:1B:1A

Organization

e-trees Japan, Inc.

Address

Oowada-cho 2-9-2 Hachioji-city Tokyo JP 150-0001

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.