Database update

There are two sources of IP-address data
- When people are good enough to identify their city, it is stored in the DB and associated with the /24 they are currently using. This is obviously the best info. source.
- There are (currently 10) robots on the server, tracerouting to IP addresses within /24's that we haven't yet identified. There are then several hundred regular-expression rules (from sarangworld) which match parts of the names detected to countries/cities..
The Sarangworld database was built in 1999-2000.
The technic used by him is a basic IP ping and tracert system with filters with a lot of holes.
Since these last 5 years, several hundred of thousand IP have changed.
Each month, some thousand of IP change.
The update of hostip database come only from some monthly dozen manual changes by visitor lost ?
Or several server run every days to update this system ?