National Oilwell Varco Instrumentation, Monitoring, and Optimization (NOV IMO)

Any device whose MAC address begins with C4:C1:9F has a network interface built by National Oilwell Varco Instrumentation, Monitoring, and Optimization (NOV IMO). This prefix (the OUI, or Organizationally Unique Identifier) is assigned by the IEEE and is the first three octets of the address.

OUI prefix

C4:C1:9F

Organization

National Oilwell Varco Instrumentation, Monitoring, and Optimization (NOV IMO)

Address

1200 Cypress Creek Rd. Cedar Park TX US 78613

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.