Every resolver knows how to find the invisible `.` at the end of domain names (for example, `cloudflare.com.`). There are [hundreds of root servers](http://www.root-servers.org/) all over the world that host the `.` file, and resolvers are [hard coded to know the IP addresses](http://www.internic.net/domain/named.root) of those servers. Cloudflare itself hosts [that file](http://www.internic.net/domain/root.zone) on all of its servers around the world through a [partnership with ISC](https://blog.cloudflare.com/f-root/).
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