American Time and Signal

Any device whose MAC address begins with 00:11:6D has a network interface built by American Time and Signal. This prefix (the OUI, or Organizationally Unique Identifier) is assigned by the IEEE and is the first three octets of the address.

OUI prefix

00:11:6D

Organization

American Time and Signal

Address

140 Third St. South Dassel MN US 55325

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.