The hosts file is used to map domains to IP addresses. With the hosts file, you can change the IP address that resolves to a domain. This change only affects your own local computer.
This is useful when you wish to see how a website will look like when hosted on a different server without making any DNS changes to your domain. We recommend doing this before changing your primary DNS. This is also necessary for WordPress as they map to the FQDN (Fully Qualified Domain Name).
The location of the hosts file, depending on the operating system that you are using, is:
Windows - SystemRoot > system32 > drivers > etc > hosts
By default the system root is c:Windows, so if you are using Windows, your hosts file is most probably: C:\Windows\System32\drivers\etc\hosts)
Linux - /etc/hosts
Mac OS X - /private/etc/hosts
Let's say that you wish to resolve yourdomain.com to the IP address 22.214.171.124. In this case you would need to open up the hosts file with a text editor and append the following line:
126.96.36.199 yourdomain.com www.yourdomain.com
This will "tell" your computer to resolve yourdomain.com to 188.8.131.52. Once you do that you may need to clear your web browser's cache, afterwards, if you try to reach your domain in a browser it should take you to the site hosted on the server with IP 184.108.40.206.
More detailed instructions on how to locate and edit the hosts file on different operating systems are available below:
Windows 8 and 10
- Press the Windows key (previously Start menu).
- Use the Search option and search for Notepad.
- Right-click Notepad and select Run as administrator.
- From Notepad, open the hosts file at: C:\Windows\System32\Drivers\etc\hosts
- Add the line and save your changes.
- Open up the Terminal.
- Use the nano command line text editor, or a different one you have available to open up the hosts file. The command with nano is as follows (the command will require your Linux user's password):
sudo nano /etc/hosts
- Add the appropriate changes in the hosts file.
- Use the Control and X key combination to save the changes
Mac OS X 10.6 through 10.12
- Open Applications -> Utilities -> Terminal.
- Edit the hosts file with a command line text editor such as nano by typing the following line in the terminal (the command will require Mac your user's password):
sudo nano /private/etc/hosts
- Add your changes at the bottom of the file.
- Save the changes with the Control and X key combination.