Telebyte, Inc.

Any device whose MAC address begins with 00:09:5F has a network interface built by Telebyte, 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

00:09:5F

Organization

Telebyte, Inc.

Address

270 Pulaski Road Greenlawn NY US 11740-1616

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.