There are a ton of online DNS tool sites, MxToolbox being one of the largest.

I like the idea of evolution (diversity + selection) applied here. Many people building it differently and letting the market decide what's most useful.

My take on this space is making it a browsable graph instead of 'just' a collection of lookup tools. The internet _is_ a graph, and it often makes sense to inspect linked resources (Domain name -> name server -> IP address, for example).

As for the longer-term vision, I'd like to make this graph as complete as possible. It now only has DNS-related tools, but adding ASNs, BGP data, hosting providers, etc. would make the existing tools more useful with every addition.