Tellabs Inc.

Any device whose MAC address begins with 04:C0:9C has a network interface built by Tellabs 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

04:C0:9C

Organization

Tellabs Inc.

Address

1415 W. Diehl Road Naperville Illinois US 60563

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.