Vollmer Werke GmbH

Any device whose MAC address begins with 00:21:D4 has a network interface built by Vollmer Werke 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:D4

Organization

Vollmer Werke GmbH

Address

Maschinenfabrik Biberach Baden-Württemberg DE 88400

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.