IANA presents specifications on this matter. For IPv4, Here's what they've in their "special reason handle registry". This means, for our uses, nearly anything in these handle blocks shouldn't be assigned since they shouldn't be routable "publicly". I believe it's a issue of symantics and can get hard to debate https://andresyfjnp.bloggerswise.com/44381402/not-known-details-about-255-payday-loan