Precision I/O

Any device whose MAC address begins with 00:16:5E has a network interface built by Precision I/O. This prefix (the OUI, or Organizationally Unique Identifier) is assigned by the IEEE and is the first three octets of the address.

OUI prefix

00:16:5E

Organization

Precision I/O

Address

4005 Miranda Ave., Suite 210 Palo Alto CA US 94304-1232

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.