The NTP Pool DNS Mapper tries mapping user IP addresses to their DNS servers (and vice-versa). It also tracks which servers support EDNS-SUBNET and how well that actually matches the client IP (as seen by the HTTP server). You can see a demo at mist.ntppool.org.

It's done to research how to improve the DNS system used by the NTP Pool and potentially other similar applications.

How can I help?
Thank you for asking! The easiest way to help is to help get more data.

If you have a website you can have your users help by adding one of the following two code snippets to your site.