C&I Technologies

Any device whose MAC address begins with 00:09:3E has a network interface built by C&I Technologies. This prefix (the OUI, or Organizationally Unique Identifier) is assigned by the IEEE and is the first three octets of the address.

OUI prefix

00:09:3E

Organization

C&I Technologies

Address

#303 Kwanbo Plaza B/D, 1467-2 Anyang-Shi Kyunggi-Do KR 431-808

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.