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The hosts file is a special file on your workstation computer that will store IP and name information. This file is checked before DNS, so if you place an entry in this file it will supersede anything set in DNS. This feature is very useful in testing websites as it will allow you to control which IP your local computer will visit regardless of what is set in DNS.
The format of the hosts file is very simple. Each line has an IP address and a hostname separated by one or more spaces. By default, hosts files typically contain entries for "localhost" as well as some comment text describing the file and its use. It is best to not change any of these lines.
220.127.116.11 example.com 18.104.22.168 www.example.com
From the Start Menu, search for "Notepad" (Win 8, 10) or navigate to: "All Programs -> Accessories -> Notepad" (Win XP, Vista, 7).
Right click on Notepad and select "Run As Administrator".
In Notepad, click "Open" and select the file
Edit file and save.
Open a terminal window.
Edit the file
/etc/hosts as root with a text editor. Example:
sudo nano /etc/hosts
Open a command prompt.
Use the command:
ping -c2 example.com
The ping results will show the IP address and confirm that it is responding.