How to know in which I.P my app will be built?

I put an HTML element in my app and into the source I set an iframe with my URL. When I’m on development, my site opens rightly, but when I click on preview, I can’t see my site, the iframe doesn’t load with the content of my site, just the others elements as combobx is showed in the app.

I guess that it’s happening because just some I.P that I allowed in my firewall server can reach my site, it’s a protection layer. So, can I discover which I.P my app is gonna be build to set allowance into my server ?

In development:

In preview:

I changed my firewall to allow all connections but the (error?) still keep in my app. The website in my iframe doesn’t appear on preview. What can be it?

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