IoT Diagnostics

Any device whose MAC address begins with A4:45:CD has a network interface built by IoT Diagnostics. This prefix (the OUI, or Organizationally Unique Identifier) is assigned by the IEEE and is the first three octets of the address.

OUI prefix

A4:45:CD

Organization

IoT Diagnostics

Address

10052 Commerce Park Drive Cincinnati OH US 45246

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.