I-Tech corporation

Any device whose MAC address begins with 00:25:AC has a network interface built by I-Tech corporation. This prefix (the OUI, or Organizationally Unique Identifier) is assigned by the IEEE and is the first three octets of the address.

OUI prefix

00:25:AC

Organization

I-Tech corporation

Address

1-15 Shin-ogawa machi Shinjyuku-ku Tokyo JP 162-0814

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.