Can I track a user using a proxy website?

Yes, it is possible for the proxy sites you request (sites such as anonymizer.com)

This is not possible with proxy gateways, as proxies intercept all client requests and then relay in turn, so by design you cannot determine the sender's IP addresses. This is what the other answers are referring to.

However, the way proxy sites work is to convert all form links resource.aspx

to proxy.com?resource.aspx

. This means that if you have AJAX requests , you can skip the proxy and let the client relay the request directly to the server there, getting the client's IP address. You can also use Adobe Flash to communicate directly with the client and bypass the website's proxy.