Recently I needed to get the IP address of the visitor to an ASP.Net (C#) web application to log into the a hit log table in the db.

Though it is fairly easy; it has some tricky points.

---

Here is the class to get the IP of the client:

using System.Web;

/*
 * sarmal.com - 2006 (C) 
 * http://www.sarmal.com/
 */

namespace com.sarmal.net
{
 public sealed class AddressInfo
 {
  public static string getIP(HttpRequest request)
  {
   string REMOTE_ADDR = request.ServerVariables["REMOTE_ADDR"];
   /* 
    * if the request is redirected through 
    * a proxy, then the correct IP is this one. 
    */
   string HTTP_X_FORWARDED_FOR = request.
    ServerVariables["HTTP_X_FORWARDED_FOR"];

   if (HTTP_X_FORWARDED_FOR != null)
   {
    return HTTP_X_FORWARDED_FOR;
   }
   else
   {
    return REMOTE_ADDR;
   }
  }

  private AddressInfo()
  {
  }
 }
}

---

The code is self explanatory, I suppose.

calling AddressInfo.getIP(); anywhere in your asp.net web application will give the user's proper IP address.

Hope that it helps someone.

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