I developed site. I need to get IP of site visitors. I try to use Request, but it have only internal IP:
Response.Write(Request.ServerVariables["REMOTE_ADDR"]); I looked all keys in Server Variables collection - the same result:
foreach (string var in Request.ServerVariables) { Response.Write(Request[var]); } How can I get external IP address?
You can use it to get External (public) IP Address..
public static string getExternalIp() { try { string externalIP; externalIP = (new WebClient()).DownloadString("http://checkip.dyndns.org/"); externalIP = (new Regex(@"\d{1,3}\.\d{1,3}\.\d{1,3}\.\d{1,3}")) .Matches(externalIP)[0].ToString(); return externalIP; } catch { return null; } } 
checkip.dyndns.org is terribly slow and often fails to respond. I recommend that a simple PHP page is used on an external webserver for this; same output, but far more reliable.
This it part of my implementation for WebTracking. So here you go a snippet for IpAddress retrieval. You can read more about the Server Variables at Wikipedia.
/// <summary> /// Get ip address from request /// </summary> /// <param name="request"></param> /// <returns></returns> private string GetIpAddress(HttpRequest request) { if (request.ServerVariables.IsNull()) return null; var _realAddress = request.ServerVariables[@"HTTP_X_FORWARDED_FOR"]; if (_realAddress.IsNullOrEmpty()) { _realAddress = request.ServerVariables[@"HTTP_FORWARDED"]; } if (_realAddress.IsNullOrEmpty()) { _realAddress = request.ServerVariables[@"REMOTE_ADDR"]; } return _realAddress; } Are you behind a load-balancer/proxy? If so, inspect the headers collection of the request for headers similar to X-FORWARDED-FOR.
You can use like this
String lstrIpAddress; if (Request.ServerVariables["HTTP_X_FORWARDED_FOR"] != null || Request.ServerVariables["HTTP_CLIENT_IP"] != null) lstrIpAddress = Request.ServerVariables["HTTP_X_FORWARDED_FOR"]; else lstrIpAddress = Request.ServerVariables["REMOTE_ADDR"]; you can simply use this nuget package. https://www.nuget.org/packages/IpPublicKnowledge/
easy and simple. here is an example :
// Get Public IP var ip = IPK.GetMyPublicIp(); //Get all IP infos var IPinfo = IPK.GetIpInfo(ip); //print some info Console.WriteLine("*--------------------------- IPK -----------------------------*"); Console.WriteLine("My public IP : " + IPinfo.IP); Console.WriteLine(); Console.WriteLine("My ISP : " + IPinfo.isp); Console.WriteLine(); Console.WriteLine("My Country : " + IPinfo.country); Console.WriteLine(); Console.WriteLine("My Languages : "); foreach (var lang in IPinfo.languages) { Console.WriteLine(" " + lang.Key + " : " + lang.Value); } Console.WriteLine("*-------------------------------------------------------------*"); Console.Read(); 
