Gummo commented on a Page, IP address functions  -  Apr 06, 2011

What is your basis for calling it invalid other than the fact that it's never used?
I looked at the IP standard as well as IP address allocation and nothing mentioned 0.0.0.0.
The only mention(s) of it were to say that an IP address is x.x.x.x where x is between 0 and 255.

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