I had a case in which I had to host multiple website on IIS on port 80.
I was able to get it working with the steps below:
1. Go to IIS manager and pick up your website:
2. Click on “Edit Bindings ” option on the targeted website :
In your last step you need to go to your DNS provider and set A DNS record to point to the ip of your web server.
It’s time to test it 😉