The Crypto Group

Any device whose MAC address begins with 00:21:CF has a network interface built by The Crypto Group. This prefix (the OUI, or Organizationally Unique Identifier) is assigned by the IEEE and is the first three octets of the address.

OUI prefix

00:21:CF

Organization

The Crypto Group

Address

Zugerstrasse 42 Steinhausen Zug CH 6312

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.