Science Corporation

Any device whose MAC address begins with 54:EF:5B has a network interface built by Science Corporation. This prefix (the OUI, or Organizationally Unique Identifier) is assigned by the IEEE and is the first three octets of the address.

OUI prefix

54:EF:5B

Organization

Science Corporation

Address

300 Wind River Way Alameda CA US 94501

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.