OPTIMEM

Any device whose MAC address begins with 00:40:EE has a network interface built by OPTIMEM. This prefix (the OUI, or Organizationally Unique Identifier) is assigned by the IEEE and is the first three octets of the address.

OUI prefix

00:40:EE

Organization

OPTIMEM

Address

297 N. BERNARDO AVENUE MOUNTAIN VIEW CA US 94043-5205

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.