"Depended on" is what I should have said. An ISP or website can be v4-only or support both, but it's not going to be v6-only.

Fair. I bet that'll change soon though. My prediction is that it'll be a mobile-first game, like the next Pokemon Go sort of thing, that'll be IPv6-only.

I agree it would probably be something mobile-first that does it, since those carriers all(?) support v6.

Plenty of mobile users use wifi at home/work. Telling them to disable their ipv4-only wifi just to play your game is going to be a non-starter, especially when the cost of ipv4 address adds negligible cost to infrastructure. Is your CTO really going to massively increase user friction ("turn of your wifi to play!") just so try to save a few cents (comparatively speaking) on infra?

It could be in a country where people don't have home wifi.

Like africa which does not have a shortage of V4 address and there is effectively no v6 rollout?

this isn't true. I know because at some point XFinity started dropping ipv6 connections for me and I noticed because a number of sites (forget which) were broken

What do you mean by dropping ipv6 connections, like dropping ipv6 packets? That's only an issue if you're using v6. I disabled ipv6 on my router years ago and have never had a problem just using v4.

I ran an ipv6-only website because that's the only way I can have a publicly routeable address at home. Just as an anecdote.

There is not a single widely used service on the Internet that depends on IPv6 exclusively.

I had to check if HackerNews even supports ipv6, apparently it only recently started: https://news.ycombinator.com/item?id=39099065

> "It's not being used", except for nearly half of Google's traffic:

One of the world's largest ISPs, Vodafone, is yet to support IPv6.

What Google supports is irrelevant if your ISP can't handle the traffic.

True, but irrelevant to my point. Whether a particular ISP supports doesn’t matter: it is being widely used by the rest of the world, to the point that it’s half of Google’s traffic.

> True, but irrelevant to my point.

Vodafone's network is reported to handle around 20% of the world's traffic. It's not a random ISP. It's network does not support IPv6. It is how a big chunk of all internet users experience the internet. Claiming it doesn't matter in a discussion over IPv6 adoption rate is ludicrous.