Consilium AB

Any device whose MAC address begins with 00:21:C4 has a network interface built by Consilium AB. 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:C4

Organization

Consilium AB

Address

Västra Finnbodavägen 2-4 Nacka Stockholm SE 13131

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.