CRESYN

Any device whose MAC address begins with 74:45:CE has a network interface built by CRESYN. This prefix (the OUI, or Organizationally Unique Identifier) is assigned by the IEEE and is the first three octets of the address.

OUI prefix

74:45:CE

Organization

CRESYN

Address

8-22,Jamwon-dong Seoul Seocho-Gu KR #137-902

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.