IANA provides standards on this subject matter. For IPv4, here is what they've of their "Exclusive function address registry". This means, for our needs, anything at all in these address blocks shouldn't be assigned since they should not be routable "publicly". Stack Exchange network is made of 183 Q&A communities https://cashamericaloan67776.blog4youth.com/37309962/getting-my-255-payday-loan-to-work