Get public/external IP address?

c# networking ip-address

185,079

Solution 1

Using C#, With webclient its a short one.

public static void Main(string[] args)
{
    string externalIpString = new WebClient().DownloadString("http://icanhazip.com").Replace("\\r\\n", "").Replace("\\n", "").Trim();
    var externalIp = IPAddress.Parse(externalIpString);

    Console.WriteLine(externalIp.ToString());
}

Command Line (works on both Linux and Windows)

wget -qO- http://bot.whatismyipaddress.com

curl http://ipinfo.io/ip

Solution 2

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();
}

Do this small trick with Check IP DNS

Use HTTPGet class i found on Goldb-Httpget C#

Solution 3

With .Net WebRequest:

  public static string GetPublicIP()
    {
        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 a4 = a3[0];
        return a4;
    }

Solution 4

string pubIp =  new System.Net.WebClient().DownloadString("https://api.ipify.org");

Solution 5

Using a great similar service

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 StreamReader(response.GetResponseStream()))
        {
            publicIPAddress = reader.ReadToEnd();
        }
    }

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

View more solutions

185,079

arbme

Updated on May 12, 2022

Comments

arbme about 2 years

I cant seem to get or find information on finding my routers public IP? Is this because it cant be done this way and would have to get it from a website?
- Alex S almost 14 years
  
  Which way is "this way"? Are you trying to do this programmatically?
- Ron Maupin about 4 years
  
  With CGN, it is possible that your router does not have a public address.
Noldorin almost 14 years

No worries. I only say because often new members are not familiar with the system... thanks.
MsBao about 10 years

404 on the second one.
Nicholas Miller almost 10 years

Great answer! By the way, I had to call Trim() on the result from http://ipinfo.io/ip. There was a trailing space.
Robert about 9 years

Could you add some commentary?
Reg Edit almost 9 years

For NATUPNPLib to work requires UPnP to be enabled in the router, which is a security issue.
ElektroStudios over 8 years

It don't works. ServerVariables member throws a null reference exception.
thepirat000 over 7 years

that cannot fail! :)
Niklas about 7 years

for some reason the GetStringAsync() as u used it here is much faster for me using a HttpClient rather than a Get Request using WebRequest. i can confirm that this works like a charm.
AFract almost 7 years

This seems to be code to find REMOTE client ip, not YOUR client public ip.
Emanuel Pirovano over 6 years

This is the best way, it works and it is short code !
Emanuel Pirovano over 6 years

Great, this is the best way
yurenchen over 6 years

ifconfig.me this domain is perfect
mjb over 5 years

thanks for the sharing. I have included your code in this article: codeproject.com/Tips/1267882/…
Paul over 5 years

This will get the server's IP address instead of the user's.
MadKonst about 5 years

Great solution, however, it depends on some other external service. Would be great to find a couple other similar services and use as a fallback. E.g. api.ipify.org and trackip.net/ip
Marcelo Vieira about 4 years

private string GetPublicIpAddress() { using var client = new WebClient(); return client.DownloadString("ifconfig.me").Replace("\n", ""); }
Marinos An about 4 years

+1 for adding the https in front. I don't know why most people in here consider normal to ask for external ip through http. By the way checkip.amazonaws.com supports ssl now.
Ron Maupin almost 4 years

That does not actually work to get the router address if the ISP is using CGN. It would only get the ISP router address.
Ron Maupin almost 4 years

That does not actually work to get the router address if the ISP is using CGN (becoming more common). It would only get the ISP router address, not the address assigned to your router.
Jesper almost 4 years

@RonMaupin Nobody is talking about the actual router address. The question is what is your IP on the Internet.
Kiquenet almost 4 years

HttpGet does not exist , alternative ?
ossentoo about 3 years

when does this ever exist, with that while loop?
Stewart over 2 years

What's the benefit of parsing the IP address, rather than outputting externalIpString directly?
sinsedrix about 2 years

I only get local IPs this way :|
absoluteAquarian about 2 years

A more up-to-date alternative: public static string GetPublicIPv4Address() => new System.Net.Http.HttpClient().GetStringAsync("http://ifconfig‌.me").GetAwaiter().G‌etResult().Replace("‌\n", "");