IANA offers benchmarks on this topic. For IPv4, Here's what they have got inside their "Exclusive function handle registry". Indicating, for our reasons, something in these deal with blocks should not be assigned since they should not be routable "publicly". Stack Exchange community includes 183 Q&A communities like Stack Overflow, https://lorenzovdhko.ampblogs.com/255-payday-loan-for-dummies-73361235