TEST & MEASUREMENT SYSTEMS INC

Any device whose MAC address begins with 00:20:CF has a network interface built by TEST & MEASUREMENT SYSTEMS INC. This prefix (the OUI, or Organizationally Unique Identifier) is assigned by the IEEE and is the first three octets of the address.

OUI prefix

00:20:CF

Organization

TEST & MEASUREMENT SYSTEMS INC

Address

2045 SITKA COURT LOVELAND CO US 80538

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.