[dsl]

At my previous company we had a subscription to Spur Intelligence. It is like Palantir for IP address info, and probably the closest to what you are talking about.

They recently added GeoIP to their data and in the bit of testing I was able to do before I left it was scary good. I also had an amusing chat with one of their engineers at a conference about how you can spoof IPInfo's location probes...

[reincoder]

> how you can spoof IPInfo's location probes...

Interesting. I would love to know how this is possible. Like with Geofeed or something else?

[monerozcash]

If you're doing latency-based probing, location spoofing is presumably possible to an extent by adding artificial delays and possibly spoofing ICMP "TTL expired" packets like https://github.com/blechschmidt/fakeroute

[dsl]

I don't think it is fair to IPInfo to give the specifics publicly, because once you have the "ah ha" moment you realize it is an entire class of difficult to address problems with how they use their sensor network. That knowledge only helps the bad guys.