Honeywell Environmental & Combustion Controls

Any device whose MAC address begins with 00:20:3D has a network interface built by Honeywell Environmental & Combustion Controls. This prefix (the OUI, or Organizationally Unique Identifier) is assigned by the IEEE and is the first three octets of the address.

OUI prefix

00:20:3D

Organization

Honeywell Environmental & Combustion Controls

Address

1985 Douglas Drive Golden Valley MN US 55422

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.