Kyeungin CNS Co., Ltd.

Any device whose MAC address begins with E0:91:3C has a network interface built by Kyeungin CNS 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

E0:91:3C

Organization

Kyeungin CNS Co., Ltd.

Address

13, Gyeongin-ro, Sosa-gu Bucheon-si Gyeonggi-do KR 14730

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.