Is there a reliable method to acquire a user's IP address even if they are using a proxy server or a similar technology?

In my quest for an answer, I've found that the solutions are not always straightforward.

Is there a foolproof method to obtain a user's IP address even if they are using a proxy, Tor, etc? I am particularly interested in a solution using ASP.NET

I find it hard to believe that "big companies" like Google, Hotmail/Outlook do not have a somewhat reliable way to overcome these obstacles, especially considering the use of Javascript (at least in Hotmail/Outlook).

Answer №1

Is there a way to uncover a user's true IP address even if they are using a secure proxy or Tor? If so, what's the advantage of utilizing these services?

  • To identify Tor users, you can examine if their IP matches that of an exit node listed on a specific website. But retrieving their actual IP without exploiting a browser vulnerability or relying on plugins like Flash or Java is challenging since most Tor users disable JavaScript and browser add-ons.

  • Certain proxies disclose their identity through the X-Forwarded-For header, enabling you to spot users employing subpar proxies. However, distinguishing good proxies from regular users is difficult as they do not provide any additional information.

If your goal is to combat bots, keep in mind that these automated programs typically just send and receive HTTP requests rather than behaving like browsers. Therefore, detecting bot-like patterns is crucial.

Answer №2

Unmasking someone's IP behind a proxy is typically not possible unless there is a direct connection to the proxy.

Occasionally, HTTP proxies may include a header line labeled "X-Forwarded" that reveals the true source IP address.

I trust this information proves useful.

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