Special Design Bureau for Seismic Instrumentation

Any device whose MAC address begins with 00:21:64 has a network interface built by Special Design Bureau for Seismic Instrumentation. This prefix (the OUI, or Organizationally Unique Identifier) is assigned by the IEEE and is the first three octets of the address.

OUI prefix

00:21:64

Organization

Special Design Bureau for Seismic Instrumentation

Address

129, Krainyaya Str. Saratov Saratov region RU 410019

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.