It's like I and Hassan said. DNS maps a name to an address. The port and context root are all part of your app.server's configuration and have nothing to do with your ISP.
If you can get
http://1.2.3.4:8080/SART working, then if [i]example.com[/i] maps to 1.2.3.4 then http://[i]example.com[/i]:8080/SART will, by definition, work just as well.
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