SignalFire Telemetry

Any device whose MAC address begins with 40:A6:3D has a network interface built by SignalFire Telemetry. This prefix (the OUI, or Organizationally Unique Identifier) is assigned by the IEEE and is the first three octets of the address.

OUI prefix

40:A6:3D

Organization

SignalFire Telemetry

Address

140 Locke Dr. Suite B Marlborough MA US 01752

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.