u10 Networks, Inc.

Any device whose MAC address begins with 00:12:04 has a network interface built by u10 Networks, 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

00:12:04

Organization

u10 Networks, Inc.

Address

2-2-14 Kakinokizaka Meguro Tokyo JP 152-0022

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.