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There is barely any legacy hardware/software that doesn't work with IPv6. It's just not an issue.

Dual-stack is also the default, and CG-NAT exists as a fallback. For IPv6 only websites there is still the option to use a HTTP proxy.

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There's still quite a few pockets of the industry where IPv6 just isn't available. Industrial control systems, for instance - there's lots of PLCs and SCADA software that are still IPv4-only. It's changing slowly, but industrial computing runs on thirty year time scales and there's still a lot of stuff out there that won't even run on modern operating systems. We use 32-bit Windows XP VMs or sometimes even FreeDOS for some of the software we use.

Those devices run in a private network and usually don't have any internet connectivity at all. If they do access the internet, it's usually limited to a few hosts that can easily be routed over some compatibility layer or a proxy.

You'd think that, but for the last decade there's been a huge push to move all the SCADA software into the cloud. "Run your plant from your phone!"

And that's not even counting the various integrators that just don't implement any kind of security at all.

I fight against this sort of thing all the time. Sometimes I get my way.

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