10/8, like 192.168/16, is a reserved network. It has different locations for different people. For me, 192.168.1.1 is a wireless hub across the room from me. That is probably true for millions of people, so every one of those people would need a different geoip database to resolve the location of reserved networks. This is why you get a lookup failure for reserved networks with the default database.
It would be possible to build your own custom database for the reserved networks you have to deal with.
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