We collect proxies from open sources around the internet. Our "spider-robot" has a large database of different websites, including forums where proxy servers are published.
When visiting such websites, the robot finds references similar to proxies, for example, a 18.104.22.168:8080 format, and takes them for verification by a proxy checker. If the check gives a positive result, the proxy gets into our proxy list. Later, proxies are regularly checked and if they stop working, they are automatically deleted from the list.
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