Discovered it after dnsstuff moved some of their tools to pay-only.
Watchmouse seems to have been bought out recently too, hope they don't go pay.
Oh apparently they have been on here before, just not the main page http://www.hnsearch.com/search#request/all&q=viewdns.inf...
What's surprising to me is that these tools are web based. Although, there is some value in having a third party verify your assumptions. It's not uncommon for me to alter my hosts file while I wait on DNS to propagate. That can screw up my resolver when running diagnostics locally.