Sort is working! Another suggestion is to allow the user to edit the DNS resolver list -- in the running program itself. An ADD/DELETE feature would be useful (to me at least).

A quick note... when I open the app I only see the left pane. I wouldn't have known there was a map had I not previously seen/read about it.

Thanks :)

I added the ability to specify a config file for the resolvers definition. This is not runtime, though. I will keep that in mind for another release.

Thanks for the follow-up :)

I added runtime by adding a resolver and removing it. I also made the map responsive.