X2E GmbH

Any device whose MAC address begins with 00:21:D5 has a network interface built by X2E GmbH. 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:D5

Organization

X2E GmbH

Address

Raiffeisenstrasse 9 Winden Rheinland-Pfalz DE 76872

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.