Detect a visitor's IP address - Free sample codes for ASP, ASP.NET, PHP, JSP

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    Detect a visitor's IP address  

How to detect a visitor's IP address

Every visitor to your site or web application has an IP address. It is quite handy to be able to get that address. It can be used for security logging, or perhaps tracing. It can also be used to determine where they are in the world, or at least where their ISP is.

The difficulty is when they're behind a proxy of some sort, you only see the IP address of the proxy server. So, here are the code snippets in PHP,JSP, ASP and .Net that first check for an IP addresses that's forwarded from behind a proxy, and if there's none then just get the IP address.

  • PHP without Proxy detection
    <? $ipaddress = getenv(REMOTE_ADDR); ?>

  • PHP with Proxy detection
    <?if (getenv(HTTP_X_FORWARDED_FOR)) {
    $ipaddress = getenv(HTTP_X_FORWARDED_FOR);
    } else {
    $ipaddress = getenv(REMOTE_ADDR); }

  • ASP without Proxy detection
    ipaddress = Request.ServerVariables("REMOTE_ADDR")

  • ASP with Proxy detection
    ipaddress = Request.ServerVariables("HTTP_X_FORWARDED_FOR")
    if ipaddress = "" then
    ipaddress = Request.ServerVariables("REMOTE_ADDR")
    end if

  • JSP without Proxy detection
    String ipaddress = request.getRemoteAddr();

  • JSP with Proxy detection
    if (request.getHeader("HTTP_X_FORWARDED_FOR") == null) {
    String ipaddress = request.getRemoteAddr();
    } else {
    String ipaddress = request.getHeader("HTTP_X_FORWARDED_FOR");

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