Hitachi Denshi, Ltd.

Any device whose MAC address begins with 00:02:05 has a network interface built by Hitachi Denshi, Ltd.. This prefix (the OUI, or Organizationally Unique Identifier) is assigned by the IEEE and is the first three octets of the address.

OUI prefix

00:02:05

Organization

Hitachi Denshi, Ltd.

Address

32 Miyaki-cho Kodaira-shi JAPAN JP 187-8511

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.