Internet app calls intranet page
Yes.  Any page that the user can browse to normally can be loaded in an iframe.
This is not so much of a specific question, but more a general one. I'm redoing one of my old projects and to make it more user friendly I want the following:
The project will be running on my home server, with a flask/python backend. User using my website will be coming from my companies intranet. Would it be possible to load an intranet page in a iframe on my website. 
So in short, is it possible to load an intranet page from an internet-page that has no access to said intranet.