Maybe a little off topic, but what's the purpose for that? Does it make websites that use google analytics unable to track your visit?
Everytime you visit a GA enabled site, it sends back some information to the Google servers including url, referrer, time spent etc. Google can use this build up a history of websites you (this is not linked to your Google account, more like an unique id) frequent and show targeted advertisements.
Yeah, I do. How forgetful of me. Thanks!
How does lack of IP turn into a 404?
If you are running a web server on your own computer that does not have a resource at that URI. 0.0.0.0 is a magic number that means any local network interface.