QUAD/GRAPHICS, INC.

Any device whose MAC address begins with 00:C0:C1 has a network interface built by QUAD/GRAPHICS, 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:C0:C1

Organization

QUAD/GRAPHICS, INC.

Address

N63 W23075 HWY 74 SUSSEX WI US 53089

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.