How can I edit my hosts file?

Sometimes you may need to modify your hosts file, especially if you are trying to preview a name based site before dns propagation occurs.  This entry details the steps you need to take to make the changes you need.


The hosts file is basically a shortcut for bypassing the standard DNS lookup that your computer would normally do to see where a website is hosted. For example, If you want to access a development version of your website to test it before going live, you can modify your hosts file to redirect only your computer to the delopment server.

The hosts file is a simple text file, and this contains IP addresses separated by whitespace (space, tab, etc) in UNIX/Linux or a single space (Windows) and then the domain name.


Here's an example:

209.191.122.70 www.yahoo.com

The location of your host file depends upon your operating system.  Here is a list of common operating systems and the location of the host file in each:

  • Windows NT/2000/XP/Vista/Windows 7: c:\Windows\System32\drivers\etc\hosts
  • Unix/Linux: /etc/hosts
  • Apple: System Folder: Preferences

 

You will need administrator privileges to edit the hosts file in Windows, and root under most UNIX-like systems.  Once you are logged in with administrator access, follow these steps to modify your hosts file:

1.  Windows Start - find/search notepad.  Right click on notepad and choose "run as administrator"

2.  From within notepad choose "File - Open" and then browse to c:\Windows\System32\drivers\etc\hosts, click open.


3.  You'll enter your IP and then domain name in the format like in the example above. There is a space in-between the IP number and domain name, and this is very important.


4.  Save the file and then close, and re-open your internet browser.


To revert back how your host file was setup previously, simply remove your newly created lines/changes from the host file and then close and open your internet browsers.


The above steps are the same under UNIX/Linux using your text editor of choice and adjusting the path as mentioned earlier.


Please be careful not to change the following entries in hosts

# localhost name resolution is handled within DNS itself.

# 127.0.0.1 localhost
# ::1 localhost



ReviewedL 10/26/2016

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