Get public/external IP address?

Question

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?

Answer 1

public string GetClientIp() {
    var ipAddress = string.Empty;
    if (System.Web.HttpContext.Current.Request.ServerVariables["HTTP_X_FORWARDED_FOR"] != null) {
        ipAddress = System.Web.HttpContext.Current.Request.ServerVariables["HTTP_X_FORWARDED_FOR"].ToString();
    } else if (System.Web.HttpContext.Current.Request.ServerVariables["HTTP_CLIENT_IP"] != null &&
               System.Web.HttpContext.Current.Request.ServerVariables["HTTP_CLIENT_IP"].Length != 0) {
        ipAddress = System.Web.HttpContext.Current.Request.ServerVariables["HTTP_CLIENT_IP"];
    } else if (System.Web.HttpContext.Current.Request.UserHostAddress.Length != 0) {
        ipAddress = System.Web.HttpContext.Current.Request.UserHostName;
    }
    return ipAddress;
} 

works perfect