Basics of Hosts file; HOSTS file location and usage

• Host File is like first referenced address book which associates hostname with IP address.

• Example to associate to
o o Last line in below image will add the mapping

• Location of hosts file

• How to update:
Open Notepad (or any other text editor) in Admin privileges to edit HOSTS file


• Block a site: Avoid ads by pointing ad sites with your local IP address
• Test one server in a cluster: you may hit any server in the cluster by default. If you want to test one specific server, add host entry
• DNS issues: When DNS has issues, HOSTS file is a workaround
• Host Header: At times, you may be able to open a site with IP address but you have to use website (without DNS entry). HOSTS file is the only option

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