Nexell

Any device whose MAC address begins with A4:5F:9B has a network interface built by Nexell. This prefix (the OUI, or Organizationally Unique Identifier) is assigned by the IEEE and is the first three octets of the address.

OUI prefix

A4:5F:9B

Organization

Nexell

Address

12F, 31 Hwangsaeul-ro 258 beon-gil, Bundang-gu Seongnam-si, Gyeonggi-do KR 13595

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.