Jaewoncnc

Any device whose MAC address begins with 5C:91:FD has a network interface built by Jaewoncnc. This prefix (the OUI, or Organizationally Unique Identifier) is assigned by the IEEE and is the first three octets of the address.

OUI prefix

5C:91:FD

Organization

Jaewoncnc

Address

A-501~507, H-Businesspark, 25 Beobwon-ro11gil, Songpa-gu, Seoul, Korea Seoul KR 05836

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.