ULTIMEDIA Co Ltd,

Any device whose MAC address begins with A4:7B:85 has a network interface built by ULTIMEDIA 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

A4:7B:85

Organization

ULTIMEDIA Co Ltd,

Address

Guro-Gu Saeaml-ro 102 Seoul KR 152770

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.