How to get client's external IPv4 address in ASP.NET without using external services?

Question

I'm currently using the following function to get external IPv4 address of my client:

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; }
        }

Is there any other way to get the same result without using any external website or services?

I have tested it with my own IP address and it was the same. But I'm also trying to get the internal IPv4 but I don't know how to do that? — Kevin Maxwell
– Kevin Maxwell, Commented Aug 13, 2015 at 12:00

Kevin Maxwell · Accepted Answer · 2015-08-14 12:01:09Z

GET INTERNAL IP ADDRESS

protected string GetInternalIP()
        {
            System.Web.HttpContext context = System.Web.HttpContext.Current;
            string ipAddress = context.Request.ServerVariables["HTTP_X_FORWARDED_FOR"];

            if (!string.IsNullOrEmpty(ipAddress))
            {
                string[] addresses = ipAddress.Split(',');
                if (addresses.Length != 0)
                {
                    return addresses[0];
                }
            }

            return context.Request.ServerVariables["REMOTE_ADDR"];
        }

GET EXTERNAL 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; }
    }

Slashy · Accepted Answer · 2015-08-13 11:55:48Z

1

No. because actually only when you're connecting to a server he can tell you where you come from... so There is not any other option except making a connection to another service. its pretty fast tho... (if this what bothered you..) Hope you understood.

answered Aug 13, 2015 at 11:55

Slashy

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8 Comments

Kevin Maxwell Over a year ago

Thank you, I thought so. It's exactly because of the connection, sometimes it takes about 10+ seconds to get the response.

Slashy Over a year ago

@KevinMaxwell yeah.. you know what i think Open.Nat actually does somthing similar.. i'll look it up for you..

Slashy Over a year ago

@KevinMaxwell no.. they also request it from a service.. i just tried checkip.dyndns.org and it was really fast.. i think that's the most efficient and stable site for reteriving your ip.. by the way if you would like to not freeze the aplication while retreiving the Ip adress-just use it on a thread or use async method.. notify me if you need some help with that. Good luck

Kevin Maxwell Over a year ago

I think you are reading my mind. I actually want to put a "Loader" while it's fetching the IP address.

Slashy Over a year ago

Let us continue this discussion in chat.

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How to get client's external IPv4 address in ASP.NET without using external services?

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