All Proxies.com proxies support testing by FOGLDN Proxy Tester. 

On the main area of the tester change the "Destination URL" to https://www.whatismyip.net/

Then click on "Import Proxies" in the bottom left and enter the proxies as indicated.

If you run into problems, do be aware of 2 things:

1. If your proxy is IPv6 then it may not work if you use a different destination URL.  IPv6 requires the destination site to support IPv6.

2. If your proxy is IPv4 then it may not work if you use a different destination URL.  Our IPv4 proxies are limited by domain and if you enter a domain that is not paid for or white listed then it will fail.