How to get the public IP address of a user in C#

This is what I use:

protected void GetUser_IP() { string VisitorsIPAddr = string.Empty; if (HttpContext.Current.Request.ServerVariables["HTTP_X_FORWARDED_FOR"] != null) { VisitorsIPAddr = HttpContext.Current.Request.ServerVariables["HTTP_X_FORWARDED_FOR"].ToString(); } else if (HttpContext.Current.Request.UserHostAddress.Length != 0) { VisitorsIPAddr = HttpContext.Current.Request.UserHostAddress; } uip.Text = "Your IP is: " + VisitorsIPAddr; } 

"uip" is the name of the label in the aspx page that shows the user IP.

You can use "HTTP_X_FORWARDED_FOR" or "REMOTE_ADDR" header attribute.

Refer method GetVisitorIPAddress from Machine Syntax blog .

 /// <summary> /// method to get Client ip address /// </summary> /// <param name="GetLan"> set to true if want to get local(LAN) Connected ip address</param> /// <returns></returns> public static string GetVisitorIPAddress(bool GetLan = false) { string visitorIPAddress = HttpContext.Current.Request.ServerVariables["HTTP_X_FORWARDED_FOR"]; if (String.IsNullOrEmpty(visitorIPAddress)) visitorIPAddress = HttpContext.Current.Request.ServerVariables["REMOTE_ADDR"]; if (string.IsNullOrEmpty(visitorIPAddress)) visitorIPAddress = HttpContext.Current.Request.UserHostAddress; if (string.IsNullOrEmpty(visitorIPAddress) || visitorIPAddress.Trim() == "::1") { GetLan = true; visitorIPAddress = string.Empty; } if (GetLan && string.IsNullOrEmpty(visitorIPAddress)) { //This is for Local(LAN) Connected ID Address string stringHostName = Dns.GetHostName(); //Get Ip Host Entry IPHostEntry ipHostEntries = Dns.GetHostEntry(stringHostName); //Get Ip Address From The Ip Host Entry Address List IPAddress[] arrIpAddress = ipHostEntries.AddressList; try { visitorIPAddress = arrIpAddress[arrIpAddress.Length - 2].ToString(); } catch { try { visitorIPAddress = arrIpAddress[0].ToString(); } catch { try { arrIpAddress = Dns.GetHostAddresses(stringHostName); visitorIPAddress = arrIpAddress[0].ToString(); } catch { visitorIPAddress = "127.0.0.1"; } } } } return visitorIPAddress; } 

Combination of all of these suggestions, and the reasons behind them. Feel free to add more test cases too. If getting the client IP is of utmost importance, than you might wan to get all of theses are run some comparisons on which result might be more accurate.

Simple check of all suggestions in this thread plus some of my own code...

 using System.IO; using System.Net; public string GetUserIP() { string strIP = String.Empty; HttpRequest httpReq = HttpContext.Current.Request; //test for non-standard proxy server designations of client's IP if (httpReq.ServerVariables["HTTP_CLIENT_IP"] != null) { strIP = httpReq.ServerVariables["HTTP_CLIENT_IP"].ToString(); } else if (httpReq.ServerVariables["HTTP_X_FORWARDED_FOR"] != null) { strIP = httpReq.ServerVariables["HTTP_X_FORWARDED_FOR"].ToString(); } //test for host address reported by the server else if ( //if exists (httpReq.UserHostAddress.Length != 0) && //and if not localhost IPV6 or localhost name ((httpReq.UserHostAddress != "::1") || (httpReq.UserHostAddress != "localhost")) ) { strIP = httpReq.UserHostAddress; } //finally, if all else fails, get the IP from a web scrape of another server else { WebRequest request = WebRequest.Create("http://checkip.dyndns.org/"); using (WebResponse response = request.GetResponse()) using (StreamReader sr = new StreamReader(response.GetResponseStream())) { strIP = sr.ReadToEnd(); } //scrape ip from the html int i1 = strIP.IndexOf("Address: ") + 9; int i2 = strIP.LastIndexOf("</body>"); strIP = strIP.Substring(i1, i2 - i1); } return strIP; } 

That code gets you the IP address of your server not the address of the client who is accessing your website. Use the HttpContext.Current.Request.UserHostAddress property to the client's IP address.

For Web Applications ( ASP.NET MVC and WebForm )

/// <summary> /// Get current user ip address. /// </summary> /// <returns>The IP Address</returns> public static string GetUserIPAddress() { var context = System.Web.HttpContext.Current; string ip = String.Empty; if (context.Request.ServerVariables["HTTP_X_FORWARDED_FOR"] != null) ip = context.Request.ServerVariables["HTTP_X_FORWARDED_FOR"].ToString(); else if (!String.IsNullOrWhiteSpace(context.Request.UserHostAddress)) ip = context.Request.UserHostAddress; if (ip == "::1") ip = "127.0.0.1"; return ip; } 

For Windows Applications ( Windows Form, Console, Windows Service , ... )

 static void Main(string[] args) { HTTPGet req = new HTTPGet(); req.Request("http://checkip.dyndns.org"); string[] a = req.ResponseBody.Split(':'); string a2 = a[1].Substring(1); string[] a3=a2.Split('<'); string a4 = a3[0]; Console.WriteLine(a4); Console.ReadLine(); } 

So many of these code snippets are really big and could confuse new programmers looking for help.

How about this simple and compact code to fetch the IP address of the visitor?

string ip = System.Web.HttpContext.Current.Request.ServerVariables["HTTP_X_FORWARDED_FOR"]; if (string.IsNullOrEmpty(ip)) { ip = System.Web.HttpContext.Current.Request.ServerVariables["REMOTE_ADDR"]; } 

Simple, short and compact.

I have an extension method:

public static string GetIp(this HttpContextBase context) { if (context == null || context.Request == null) return string.Empty; return context.Request.ServerVariables["HTTP_X_FORWARDED_FOR"] ?? context.Request.UserHostAddress; } 

Note: "HTTP_X_FORWARDED_FOR" is for ip behind proxy. context.Request.UserHostAddress is identical to "REMOTE_ADDR".

But bear in mind it is not necessary the actual IP though.

Sources:

IIS Server Variables

Link

My version handles both ASP.NET or LAN IPs:

/** * Get visitor's ip address. */ public static string GetVisitorIp() { string ip = null; if (HttpContext.Current != null) { // ASP.NET ip = string.IsNullOrEmpty(HttpContext.Current.Request.ServerVariables["HTTP_X_FORWARDED_FOR"]) ? HttpContext.Current.Request.UserHostAddress : HttpContext.Current.Request.ServerVariables["HTTP_X_FORWARDED_FOR"]; } if (string.IsNullOrEmpty(ip) || ip.Trim() == "::1") { // still can't decide or is LAN var lan = Dns.GetHostEntry(Dns.GetHostName()).AddressList.FirstOrDefault(r => r.AddressFamily == AddressFamily.InterNetwork); ip = lan == null ? string.Empty : lan.ToString(); } return ip; } 

 private string GetClientIpaddress() { string ipAddress = string.Empty; ipAddress = HttpContext.Current.Request.ServerVariables["HTTP_X_FORWARDED_FOR"]; if (ipAddress == "" || ipAddress == null) { ipAddress = HttpContext.Current.Request.ServerVariables["REMOTE_ADDR"]; return ipAddress; } else { return ipAddress; } } 

On MVC 5 you can use this:

string cIpAddress = Request.UserHostAddress; //Gets the client ip address 

or

string cIpAddress = Request.ServerVariables["REMOTE_ADDR"]; //Gets the client ip address 

In MVC IP can be obtained by the following Code

string ipAddress = Request.ServerVariables["REMOTE_ADDR"]; 

string IP = HttpContext.Current.Request.Params["HTTP_CLIENT_IP"] ?? HttpContext.Current.Request.UserHostAddress; 

just use this..................

public string GetIP() { 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; } 

We connect to servers that give us our external IP address and try to parse the IP from returning HTML pages. But when servers make small changes on these pages or remove them, these methods stop working properly.

Here is a method that takes the external IP address using a server which has been alive for years and returns a simple response rapidly... https://www.codeproject.com/Tips/452024/Getting-the-External-IP-Address

Private 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; } } 

VB.NET

Imports System.Net Private Function GetExternalIp() As String Try Dim ExternalIP As String 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 Nothing End Try 

End Function

lblmessage.Text =Request.ServerVariables["REMOTE_HOST"].ToString(); 

You can download xNet at: https://drive.google.com/open?id=1fmUosINo8hnDWY6s4IV4rDnHKLizX-Hq

First, you need import xNet, code:

using xNet; 

Code:

void LoadpublicIP() { HttpRequest httprequest = new HttpRequest(); String HTML5 = httprequest.Get("https://whoer.net/").ToString(); MatchCollection collect = Regex.Matches(HTML5, @"<strong data-clipboard-target="".your-ip(.*?)</strong>", RegexOptions.Singleline); foreach (Match match in collect) { var val = Regex.Matches(match.Value, @"(?<ip>(\d|\.)+)"); foreach (Match m in val) { richTextBox1.Text = m.Groups[2].Value; } } }