Gen2wave

Any device whose MAC address begins with 28:38:CF has a network interface built by Gen2wave. This prefix (the OUI, or Organizationally Unique Identifier) is assigned by the IEEE and is the first three octets of the address.

OUI prefix

28:38:CF

Organization

Gen2wave

Address

Gumi-dong, Bundang-gu Seongnam-si Gyeonggi-do KR 463-741

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.