NETEXPRESS

Any device whose MAC address begins with 00:C0:21 has a network interface built by NETEXPRESS. 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:C0:21

Organization

NETEXPRESS

Address

989 EAST HILLSDALE BLVD. FOSTER CITY CA US 94404-2113

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.