PATECH

Any device whose MAC address begins with 7C:3E:9D has a network interface built by PATECH. This prefix (the OUI, or Organizationally Unique Identifier) is assigned by the IEEE and is the first three octets of the address.

OUI prefix

7C:3E:9D

Organization

PATECH

Address

#23-17. WonhyoRo-2Ga YongSan-Gu Seoul KR 140112

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.