FOUR PHASE SYSTEMS

Any device whose MAC address begins with 08:00:5C has a network interface built by FOUR PHASE SYSTEMS. This prefix (the OUI, or Organizationally Unique Identifier) is assigned by the IEEE and is the first three octets of the address.

OUI prefix

08:00:5C

Organization

FOUR PHASE SYSTEMS

Address

2001 LOGIC DRIVE SAN JOSE CA US 95124-3452

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.