Sinwatec

Any device whose MAC address begins with D4:31:9D has a network interface built by Sinwatec. This prefix (the OUI, or Organizationally Unique Identifier) is assigned by the IEEE and is the first three octets of the address.

OUI prefix

D4:31:9D

Organization

Sinwatec

Address

76 Rikhard Zorge st. Ufa Bashkortostan RU 450075

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.