The geographical location of Internet IP addresses is important for academic research, commercial and homeland security applications. Thus, both commercial and academic databases and tools are available for mapping IP addresses to
Evaluating the accuracy of these mapping services is complex since obtaining diverse large scale ground truth is very hard. In this work we evaluate mapping services using an algorithm that groups IP addresses to PoPs, based on
structure and delay.
This way we are able to group close to 100,000 IP addresses world wide into groups that are known to share a geo-location with high confidence. We provide insight
into the strength and weaknesses of IP geolocation databases, and discuss their accuracy and encountered anomalies. Index Terms
—Geographic Information Systems, Web and
internet services, Internet topology. (pdf)