Mar 25, 2014 02:16 AM|Starain chen - MSFT|LINK
The website URL should have the port to access regardless of access it by IP or host name. By default it used the 80 port, so we needn’t type it again.
For your requirement, you could create a new application under the website that used the 80 port. (Right click that website in the IIS=>Add Application)
On the other hand, if you add the host name to the website, you should add the host map to the hosts file that path is C:\Windows\System32\drivers\etc