Houwa System Design Corp.

Any device whose MAC address begins with 3C:99:8C has a network interface built by Houwa System Design Corp.. This prefix (the OUI, or Organizationally Unique Identifier) is assigned by the IEEE and is the first three octets of the address.

OUI prefix

3C:99:8C

Organization

Houwa System Design Corp.

Address

4F Matubara Building 3-22-14 Shibuyaku Higashi Tokyo JP 150-0011

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.