asp net routing add special convention mysitye/string

Hello I am new with ASP NET MVC

I have a web page with default routing

        public static void RegisterRoutes(RouteCollection routes)
    {
        routes.IgnoreRoute("{resource}.axd/{*pathInfo}");
    routes.MapRoute(
        name: "Default",
        url: "{controller}/{action}/{id}",
        defaults: new { controller = "Home", action = "Index", id = UrlParameter.Optional }
    );
}

I have been working developing a URL shortener that creates 5 character strings in base 32 (A-Z 0-9). My idea is to have the default routing in ASP NET MVC and add a special case forwww.mypage.com/ASD12 //this is the random code generated by my application

How can I add this exception to my routing and always make URLs (mypage.test/code) land in a specific controller action

 public class CodeController : Controller

{

public async Task<ActionResult> Index(string code)

{//do things here}

}

Thank you very much

#c-sharp #asp.net