How to locate and edit the Hosts file on a Mac

1. Open the Terminal app on your Mac.

2. Type “sudo nano /private/etc/hosts”.

3. Enter the administrator password for your user account.

4. Enter the IP address and hostname you need in the hosts file. For example: 

<IP address>   <hostname>

10.8.4.2            server1

5. Press “Control + X” and then “Y” to save the changes. 

6. Type “sudo dscacheutil -flushcache; sudo killall -HUP mDNSResponder” or “sudo killall -HUP mDNSResponder” or shutdown and restart your Mac.

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