IANA offers specifications on this matter. For IPv4, here is what they have of their "special function deal with registry". Indicating, for our applications, everything in these handle blocks shouldn't be assigned because they shouldn't be routable "publicly". Number945Number945 61711 gold badge55 silver badges99 bronze badges 1 one I've seen https://emilianovbcgg.acidblog.net/67654978/detailed-notes-on-255-payday-loan