Layer3TV, Inc

Any device whose MAC address begins with 40:42:29 has a network interface built by Layer3TV, 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

40:42:29

Organization

Layer3TV, Inc

Address

1660 Wynkoop St - Suite 800 Denver CO US 80202

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.