How to get a user's client IP address in ASP.NET?

Question

We have Request.UserHostAddress to get the IP address in ASP.NET, but this is usually the user\'s ISP\'s IP address, not exactly the user\'s machine IP address

Answer 1

If you are using CloudFlare, you can try this Extension Method:

public static class IPhelper
{
    public static string GetIPAddress(this HttpRequest Request)
    {
        if (Request.Headers["CF-CONNECTING-IP"] != null) return Request.Headers["CF-CONNECTING-IP"].ToString();

        if (Request.ServerVariables["HTTP_X_FORWARDED_FOR"] != null) return Request.ServerVariables["HTTP_X_FORWARDED_FOR"].ToString();

        return Request.UserHostAddress;
    }
}

then

string IPAddress = Request.GetIPAddress();