Reliable GeoIP database

["Scott Q." <qmail () top-consulting net>]

What are you guys using as a reliable GeoIP database ? I've tried
Maxmind and a few others, also checking against ARIN but there's tons
of differences.

For example: 1.2.9.0/24 . ARIN says it belongs to China Telecom but
others say it's part of Russia: https://ipregistry.co/1.2.9.0 

How to handle such cases ?

Thanks!
Scott​​