CSJ Global, Inc.

Any device whose MAC address begins with 00:21:C6 has a network interface built by CSJ Global, Inc.. This prefix (the OUI, or Organizationally Unique Identifier) is assigned by the IEEE and is the first three octets of the address.

OUI prefix

00:21:C6

Organization

CSJ Global, Inc.

Address

9th Fl. Samwhan Bldg. Annex, 17-26 Yeouido-dong, Seoul KR 150-874

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.