How to Get Public IPv4 Address Using C#

In this article, we will see the multiple examples to get the public IP Address of a computer using C#.

You should check out the docs.

Example 1,

static string GetPublicIPAddress()

{

    String address = "";

    WebRequest request = WebRequest.Create("http://checkip.dyndns.org/");

    using (WebResponse response = request.GetResponse())

    using (System.IO.StreamReader stream = new System.IO.StreamReader(response.GetResponseStream()))

    {

        address = stream.ReadToEnd();

    }

    int first = address.IndexOf("Address: ") + 9;

    int last = address.LastIndexOf("</body>");

    address = address.Substring(first, last - first);

    return address;

}

Example 2,

private string GetPublicIPAddress()

{

  var request = (HttpWebRequest)WebRequest.Create("http://ifconfig.me");

  request.UserAgent = "curl"; // this will tell the server to return the information as if the request was made by the linux "curl" command

  string publicIPAddress;

  request.Method = "GET";

  using(WebResponse response = request.GetResponse())

  {

      using(var reader = new System.IO.StreamReader(response.GetResponseStream()))

      {

        publicIPAddress = reader.ReadToEnd();

      }

  }

  return publicIPAddress.Replace("\n", "");

}

Example 3,

public static string GetPublicIPAddress ()

{

    string url = "http://checkip.dyndns.org";

    System.Net.WebRequest req = System.Net.WebRequest.Create(url);

    System.Net.WebResponse resp = req.GetResponse();

    System.IO.StreamReader sr = new System.IO.StreamReader(resp.GetResponseStream());

    string response = sr.ReadToEnd().Trim();

    string[] a = response.Split(':');

    string a2 = a[1].Substring(1);

    string[] a3 = a2.Split('<');

    string ip = a3[0];

    

    return ip;

}

You must see this - How to get public IP address in JavaScript | jQuery