4NSYS Co. Ltd.

Any device whose MAC address begins with 00:18:7B has a network interface built by 4NSYS 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

00:18:7B

Organization

4NSYS Co. Ltd.

Address

3F, Hana Bldg Guro-Gu Seoul KR 152-100

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.