O2 MICRO, INC.

Any device whose MAC address begins with 00:D0:51 has a network interface built by O2 MICRO, 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:D0:51

Organization

O2 MICRO, INC.

Address

2901 TASMAN DRIVE, STE.#205 SANTA CLARA CA US 95054

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.