MCOT Corporation

Any device whose MAC address begins with A4:56:1B has a network interface built by MCOT Corporation. This prefix (the OUI, or Organizationally Unique Identifier) is assigned by the IEEE and is the first three octets of the address.

OUI prefix

A4:56:1B

Organization

MCOT Corporation

Address

Yogohigashi 1-5-12 Matsuyama city Ehime prefecture JP 790-0044

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.