We at IPinfo use our ProbeNet of 1,100+ PoPs to generate active measurements backed IP geolocation data. However, we prefer to let the evidence speak for our IP geolocation accuracy and, in that effort, we recommend our users to use third-party tools to verify our data accuracy themselves. These tools can be multiple location ping services like ping.sx.
These multiping service works similarly to our ProbeNet, meaning it pings an IP address from various locations simultaneously and returns the RTT. It is a tool, not an IP geolocation provider. Due to this multiple location ping mechanism, they act as a more independent third-party platform to verify our results.
We could use our ProbeNet to ping these IPs, but we have not built a web UI for our ProbeNet to use it in a similar way.
Multiping services: