Midokura Co., Ltd.

Any device whose MAC address begins with AC:CA:BA has a network interface built by Midokura Co., 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

AC:CA:BA

Organization

Midokura Co., Ltd.

Address

7th Floor Azabudai Hinoki building Tokyo JP 106-0041

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.