Valmet Automation

Any device whose MAC address begins with 00:40:AA has a network interface built by Valmet Automation. This prefix (the OUI, or Organizationally Unique Identifier) is assigned by the IEEE and is the first three octets of the address.

OUI prefix

00:40:AA

Organization

Valmet Automation

Address

Lentokentänkatu 11, P.O.Box 237 Tampere FI FIN-3310

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.