This link tells us about hosts and how to fix into default mode.
But also you can block or not some unwanted connections.

Example:
The 0.0.0.0 (prefix) is considered the location of your computer, so when an entry listed in the MVPS HOSTS file is requested on a page you are viewing, your computer thinks 0.0.0.0 is the location of the file.

Also, some got some info from the regedit tool.

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