I just finished integrating geo IP lookups into an app I'm working on, using a library that queries a number of the free IP lookup services out there. Something that I've learned from this is just how hard it is to stay on top of IP geolocations. Most of the free services use incomplete or outdated databases, and if you want decent accuracy you probably need to opt for a paid package from a company who has the resources to track IP address location changes, and keep their database up to date.

So, I'm wondering, does ipinfo.io maintain their own database, or do they sub-license someone else's database? If they're maintaining their own, how good are they at keeping it valid and updated and what is the coverage like?