获取客户端的公网IP地址

Question

I'm creating a web application where I need a functionality that if someone client log in to my website the client's public IP address must be logged. I have some javascript to do this but some of my pal not agree to use a javascript library reason they don't trust it. Such as http://l2.io/ip.js?var=myip as mentioned here

So we need all of it as server side code. So i found few more code in this link but unfortunately I'm not getting the expected result (it only returns local hosts IP). Could anyone help me to solve this please.

I have tried the bellow code

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;
}

but this is not providing me the public IP. Do I need to deploy it or something.

Answer 1

HttpContext.Current.Request.UserHostAddress

This should get the public IP address of a client

EDIT

So you're after the IP address of your own machine as the rest of the world sees it?? This only really matters if you're hosting in on lets say an Intranet where the clients will be on the same network and thats the only address you will get if you use HttpContext.Current.Request.UserHostAddress . You will need to use a lookup api or something in this case. But then you'd know the external IP of your network!

If this is to be hosted on the internet then HttpContext.Current.Request.UserHostAddress will work just fine as every client will be displaying it's external IP.

It's showing 127.0.0.1 I'm guessing because you're testing on your local machine and this will be it's loopback address.

Hope this helps