Jefferson Audio Video Systems, Inc.

Any device whose MAC address begins with 5C:40:58 has a network interface built by Jefferson Audio Video Systems, 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

5C:40:58

Organization

Jefferson Audio Video Systems, Inc.

Address

13020 Middletown Industrial Blvd. Louisville Kentucky US 40223

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.