Not OP but read about it on this hosts config [0].
From that page:
> We prefer to use 0.0.0.0, which is defined as a non-routable meta-address used to designate an invalid, unknown, or non applicable target.
> Using 0.0.0.0 is empirically faster, possibly because there's no wait for a timeout resolution. It also does not interfere with a web server that may be running on the local PC.
From that page:
> We prefer to use 0.0.0.0, which is defined as a non-routable meta-address used to designate an invalid, unknown, or non applicable target.
> Using 0.0.0.0 is empirically faster, possibly because there's no wait for a timeout resolution. It also does not interfere with a web server that may be running on the local PC.
[0] https://github.com/StevenBlack/hosts