ParTech Inc.

Any device whose MAC address begins with 00:40:B3 has a network interface built by ParTech 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

00:40:B3

Organization

ParTech Inc.

Address

8383 Seneca Turnpike NEW HARTFORD NY US 13413

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.