The only official and up to date address database in Russia - FIAS.
It must support ALL municipalities.
All other database - unofficial.
At birth in the Russian Federal database called KLADR. The quality of the database was very high. After the birth of the concept of data exchange between official bodies and the later website services all targeted bases was accepted malohovskiy KLADR. But the actualization came from the on the municipal bodies (although physically the database and is in FTS). Changed the name. The quality (uniformity of names, types), and more importantly the relevance of the DB fell down, of course. But the best DB there. I'm sure all the other sites anyway enjoy the FIAS.
Before from FIAS database were regularly exported to the KLADR format (DBF). But 01.01.2018 database format KLADR not actualizarea.FIAS