STAR-TEK, INC.

Any device whose MAC address begins with 00:40:5D has a network interface built by STAR-TEK, 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

00:40:5D

Organization

STAR-TEK, INC.

Address

71 LYMAN STREET NORTHBORO MA US 01532

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.