DNS and Subdomain IIS

I have 2 web apps installed on my IIS, one runnin开发者_如何转开发g as app1.mydomain and other one as app2.mydomain

In the test environment I just copied about two entries pointed to 127.0.0.1

What changes do I have to do in order to put this on production server, I mean on DNS level?

Can I use URL re-write on IIS to avoid changes for DNS?

Thanks

You need to add A or CNAME records mapping both subdomains to the external IP address of your server.

This tells web browsers to go to your server when you go to the subdomain; URL rewriting has nothing to do with this.