YOISYS

Any device whose MAC address begins with 00:27:06 has a network interface built by YOISYS. This prefix (the OUI, or Organizationally Unique Identifier) is assigned by the IEEE and is the first three octets of the address.

OUI prefix

00:27:06

Organization

YOISYS

Address

309-52 SUNGSU-2GA, 1DONG, SUNGDONG-GU SEOUL KR 133-827

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.