I really like the website and respect for supporting IPv6 ;) Are you going to keep scanning the v4 address space to see if meta-data changes? If not the data might go out of date rapidly. I see the site plans to add a paid API. Fair... I'm not too sure if people will buy it when you can probably download text files with much the same data as what's on this site. Though I might be wrong here.

If you wanted to do something genuinely cool you could try to build an algorithmic model of latency between network points on the Internet. Such that it would be possible to estimate latency between any two network paths without sending packets first to measure it. I think I read research somewhere that this is possible and it could have applications in routing, distributed systems, and high performance networking.