The benefits of deploying IPv6 only

Exactly. And as the home speeds reach 1Gbps to the home, there will not be enough CGN boxes that will be able to sustain that load, so one of the two options: 1) more stateless mechanisms will be used (lw4o6, MAP) - which do not give the entire IPv4 address to residential users => so even if the service has an IPv4 address, the clients might have to go through the hurdles to get to it. Service providers are planning to go IPv6-only, and content providers already note that IPv6 gives a double-digit performance increase compared to IPv4 [1] 2) The residential ISPs will debundle the IPv4 from the cost - given that a lot of the sites average consumer needs (google, facebook, youtube, netflix) are already IPv6-enabled. For this case, you will not be even able to see that something is "wrong". Just the users will click on the link, see it's not reachable, say "huh?" and move on. [1] [this video] - 1h12 well spent.

There will be no abrupt end. Just the price per IP will slowly grow, and the usefulness of this IP will slowly fade. There's no panic. The trick with IPv6 deployment is predicting two years in advance the moment will you need IPv6 "tomorrow" - because for a lot of orgs that's how long it takes. I'll repost a link from the recent NANOG meeting here about the folks seriously discussing their plans of going IPv6-only: [this video] By the way, if you're reading this from a smartphone in the US, try this link: [link] I thoroughly enjoyed the moment when one networking pro (who dealt with IPv6 20 years ago and not since) was telling me he won't have IPv6 till he retires, realized he had his on his LTE connection and was using it for quite some time already! :-) I repeat myself from another post: One out of five users hitting google.com and facebook.com in the US today does so over IPv6.