ULTIMATE TECHNOLOGY CORP.

Any device whose MAC address begins with 00:90:51 has a network interface built by ULTIMATE TECHNOLOGY CORP.. This prefix (the OUI, or Organizationally Unique Identifier) is assigned by the IEEE and is the first three octets of the address.

OUI prefix

00:90:51

Organization

ULTIMATE TECHNOLOGY CORP.

Address

100 RAWSON ROAD VICTOR NY US 14564

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.