We constantly check that proxy is alive by making several requests to 3 different websites.

We measure total time for each request and calculate medium time. Please note that it's not classic latency like in ping command. It's total duration of the request: from the moment it started and until we got some HTTP response from remote server.

All requests to the proxies are made from our data center in Frankfurt, Germany with 10 gbit/s network connection.

Geolocation is usually detected with special databases that contain information about country, region, city and IP subnets that are assigned to it. Some of them are paid, some are free. Some of them contain controversial information about same IP.

To make it more confident, we use two services to detect location: api.ipkit.io and ipinfo.io.

We save new geo records only when IP changes. If IP of the proxy doesn't change, you won't see many rows in the table below.