Hi Tim,

> Are there any accuracy comparisons between MaxMind and IP2Location?
>
> We have noticed that GeoIP providers often focus on location accuracy for
> residential customers. But we use our GeoIP databases to locate both Tor
> clients (mainly residential) and Tor relays (mainly data centre).
>
> How is your accuracy for data centres?

I don't aware of any research papers targeting data center only. IP2Location should be highly accurate because we are using network routing information to determine physical location instead of registrant address.

For example, IP2Location is reporting 185.56.163.144 as in France after reviewing the network routing information as below. However, if you search the same IP address in other geolocation providers, you might see it as reported as North Korea, a country with limited Internet access.

Tracing route to 185.56.163.144 over a maximum of 30 hops

  1     1 ms   <10 ms     1 ms  192.168.1.1
  2     *        *        *     Request timed out.
  3     5 ms     4 ms     3 ms  10.233.65.32
  4   178 ms   179 ms   179 ms  10.55.200.67
  5   270 ms   267 ms   273 ms  ams-ix2.eu.iptransit.com [80.249.211.47]
  6   283 ms   285 ms   283 ms  xe-4-3-1.r2.ams.iptransit.com [204.26.60.115]
  7   283 ms   284 ms   283 ms  te2-4.r3.ams.sara.nl.iptransit.com [204.26.60.6]
  8   282 ms   279 ms   281 ms  te1-2.r2.lux.iptransit.com [204.26.60.9]
  9   285 ms   284 ms   284 ms  204.26.60.123
 10   288 ms   287 ms   287 ms  185.56.163.144
 
 
 - Kim