How to Restore Previous Versions of your Files on Mac.
Once you change it to default, it may resolve some connectivity problems that you have with your computer. This is how you can reset hosts file to default. The hosts file is usually used just to map web addresses to specific IP addresses and to block websites (by re-directing/mapping them to invalid/incorrect IPs).
With this huge update to the hosts file, you might want to restart your computer.
You will be prompted to replace the file and then prompted for the admin password
Copy the following piece of text and paste it into the hosts file.Erase everything in it by pressing Command + A to select all and then press the delete key.Double-click the hosts file (on the desktop), and it will open in TextEdit (or any default text editor on your Mac).(We are doing this because we can’t open directly and edit it.) From the finder window, click and drag the hosts file to the desktop.Type this in the Go to Folder window: /private/etc/hosts.From the Finder, navigate to Go → Go to Folder.To reset, we are going to open the hosts file in a text editor, replace the entire file with the default text and save it. The rest of the stuff is just commented out (description of the hosts file itself). On a Mac, the hosts file mostly contains nothing more than a couple of lines of active code. How to Reset the Hosts File Back to Default in macOS But in case you do not, you can still recover the original version as explained below. Of course, you should keep a backup of it before editing. It can be edited to test certain network aspects or to troubleshoot connectivity issues. The simplest explanation is that it is a text file used by your computer to map a connection between an IP address and domain names. How to Restore the Hosts File Back to Default in Windows.How to Reset the Hosts File Back to Default in macOS.Of course, you would have ideally created a backup copy of the original, but in the event that you didn’t, here’s how to reset the hosts file to default in macOS and Windows. If you have updated the file many times, the original version is gone. When you encounter an iTunes error like 3194, network failures, or connectivity issues, it is recommended to edit the hosts file.