Not to necessarily disagree with you, but that is more of a Sony problem than an IPv4 problem. - Jared Jordi Palet wrote: It is not a fixed one-time cost ... because if your users are gamers behind PSP, Sony is blocking IPv4 ranges behind CGN. So, you keep rotating your addresses until all then are blocked, then you need to transfer more IPv4 addresses ... So under this perspective, in many cases it makes more sense to NOT invest in CGN, and use that money to transfer up-front more IPv4 addresses at once, you will get a better price than if you transfer them every few months. Regards, Jordi @jordipalet El 30/3/22, 18:38, "NANOG en nombre de Jared Brown" <nanog-bounces+jordi.palet=consulintel.es at nanog.org en nombre de nanog-isp at mail.com> escribió: Randy Carpenter wrote: > >> >> Owen DeLong via NANOG wrote: > >> >> When your ISP starts charging $X/Month for legacy protocol support > >> > > >> > Out of interest, how would this come about? > >> > >> ISPs are facing ever growing costs to continue providing IPv4 services. > > Could you please be more specific about which costs you are referring to? > > > > It's not like IP transit providers care if they deliver IPv4 or IPv6 bits to > > you. > > Have you priced blocks of IPv4 addresses lately? IPv4 address blocks have a fixed one-time cost, not an ongoing $X/month cost. - Jared