ASP.NET Listening Port

Hi all,

I am not an expert in ASP.NET, unfortunately, but I do have a question. I am creating some a solution for a customer that will help understand what's applications comprise their services. As part of that process, we are looking at a URL: http://some_host:8090/some_page.aspx. This is an MVC application running as a Windows service. When I look at netstat, I see that the system process (PID 4) is occupying that port, and not the actual service. It seems to be fairly standard with Windows applications (IIS does it well).

My question is, how can trace the actual process of that Windows service? I hope that makes sense, thanks in advance.