Quick accesses
Open Commands Window: Execute: cmd
Open IIS: Execute: inetmgr
Change PC hosts
Open this with notepad: c:\windows\system32\drivers\etc\hosts
Now, you can set an ip and its host setting the ip and the dns separated by at least one space in the same line. Example:
15.140.114.22 myprivateserver.com
That will make requests to 15.140.114.22 go to myprivateserver.com, and viceversa, requests to myprivateserver.com will go to 15.140.114.22.
Check where a dns is pointing IN YOUR PC
Open cmd, ping the host dns and see which real ip is requesting.
Alternatively, open the hosts file at c:\windows\system32\drivers\etc\hosts
