RtBrick Inc.

Any device whose MAC address begins with F4:1E:5E has a network interface built by RtBrick 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

F4:1E:5E

Organization

RtBrick Inc.

Address

26 Kingston Terrace Princeton NJ US 08540

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.