How to get internet IP address from C# Windows App

Question

Possible Duplicates:
how to get my own IP address in C#?
how to get ip address of machine in c#

Hi all, I am currently developing a c# application for windows using WPF. I would like to get the computers external IP address i.e. the internet address not the local computer ip address or the local router address.

Thanks for your help.

Duplicate...http://stackoverflow.com/questions/1069103/how-to-get-my-own-ip-address-in-c — Aaron McIver, Dec 30 '10 at 21:33
Another duplicate: http://stackoverflow.com/questions/2019431/how-to-get-ip-address-of-machine-in-c — THE DOCTOR, Dec 30 '10 at 21:35
We have a triplicate on our hands unless this question get closed...triplicate...triplicate... — Aaron McIver, Dec 30 '10 at 21:37
Note that the answers on those questions tend towards showing ANY ipv4 ip, not the internet address -- which is why I think this shouldn't be closed. — NickAldwin, Dec 30 '10 at 21:46
@NickAldwin I agree the OP wants to know the internet address, whereas the other questions given as duplicates may\probably return a local IP address. — Tim Lloyd, Dec 30 '10 at 21:56
@NickAldwin Sometimes people don't read the question properly either :) — Tim Lloyd, Dec 30 '10 at 22:00
@chibacity Very true, that was not intended to be a mean comment, as I am perfectly aware that it might seem hypocritical. — NickAldwin, Dec 30 '10 at 22:17

score 5 · Answer 1 · answered Dec 30 '10 at 21:39

5

Like stated earlier, you need an external web server. An easy call to HTTP GET with the URL "http://checkip.dyndns.org/" will get you a simple text string with your IP.

answered Dec 30 '10 at 21:39

Eldad Mor

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NickAldwin · Answer 2 · 2010-12-30T21:42:55.353

1

[EDIT] A simple request to here will get you your ip.

This is a way to get any network address (not necessarily the internet ip) as pointed out in the comments:

IPAddress host = IPAddress.None;
foreach (IPAddress ip in Dns.GetHostAddresses(Dns.GetHostName()))
    {
        host = ip;
        if (ip.AddressFamily == AddressFamily.InterNetwork)
             break;
    }

edited Dec 30 '10 at 21:42

answered Dec 30 '10 at 21:33

NickAldwin

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This will retrieve the first IPv4 address of the local machine, not necessarily the external address of the machine (not even guaranteed to be a internet accessible interface). – sisve Dec 30 '10 at 21:34
Your edit answers the question. Remove the old code and you'll get an up vote from me. :) – Tim Lloyd Dec 30 '10 at 21:58
@chibacity I left it in so that Simon's comment wouldn't seem strange...and to clarify. – NickAldwin Dec 30 '10 at 22:17

score 1 · Answer 3 · edited May 23 '17 at 11:59

1

You need to have a web server sitting somewhere in the cloud so that you can call and that will be able to give you your external IP address.

Looks like this one is free.

edited May 23 '17 at 11:59

Community

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answered Dec 30 '10 at 21:34

Aliostad

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dko · Answer 4 · 2010-12-30T21:44:07.510

1

The only way I have found is to do a httpWebRequest to http://www.whatismyip.com/automation/n09230945.asp and parse the results for the ip

edited Dec 30 '10 at 21:44

answered Dec 30 '10 at 21:36

dko

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They specifically want you to not do that. See the comment in the web source: `` – NickAldwin Dec 30 '10 at 21:40

score -1 · Answer 5 · answered Dec 30 '10 at 21:38

You can try connecting to whatismyip.com, as shown in the code below:

using System;
using System.Net;
using System.Text;
using System.Text.RegularExpressions;

namespace DreamInCode.Snippets
{
    public class IpFinder
    {
        public static IPAddress GetExternalIp()
        {
            string whatIsMyIp = "http://whatismyip.com";
            string getIpRegex = @"(?<=<TITLE>.*)\d*\.\d*\.\d*\.\d*(?=</TITLE>)";
            WebClient wc = new WebClient();
            UTF8Encoding utf8 = new UTF8Encoding();
            string requestHtml = "";
            try
            {
                requestHtml = utf8.GetString(wc.DownloadData(whatIsMyIp));
            }
            catch (WebException we)
            {
                // do something with exception
                Console.Write(we.ToString());
            }
            Regex r = new Regex(getIpRegex);
            Match m = r.Match(requestHtml);
            IPAddress externalIp = null;
            if (m.Success)
            {
                externalIp = IPAddress.Parse(m.Value);
            }
            return externalIp;
        }
    }
}

NOTE: The code comes from this post http://www.dreamincode.net/forums/topic/24692-showing-the-external-ip-address-in-c%23/ .

They specifically want you to not do that. See the comment in the web source: `` Which does not require scraping -- because it is simply plain text of the ip! Do they even still include the IP in the title? — NickAldwin, Dec 30 '10 at 21:41

How to get internet IP address from C# Windows App

5 Answers5