Chiaro Networks, Ltd.

Any device whose MAC address begins with 00:03:4D has a network interface built by Chiaro Networks, 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

00:03:4D

Organization

Chiaro Networks, Ltd.

Address

P.O. Box 832427 Richardson TX US 75083-2427

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.