IANA supplies standards on this issue. For IPv4, here is what they've of their "Unique purpose address registry". That means, for our purposes, anything in these address blocks should not be assigned mainly because they should not be routable "publicly". The netmask DOES different your addresses in the community part https://fanp861qer3.daneblogger.com/35616445/not-known-facts-about-255-payday-loan