APRESIA Systems Ltd

Any device whose MAC address begins with 00:40:66 has a network interface built by APRESIA Systems 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

00:40:66

Organization

APRESIA Systems Ltd

Address

Tsukuba Network Technical Center, Kidamari 3550 Tsuchiura-shi Ibaraki-ken JP 300-0026

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.