Since MBIX turned on, we have said that IPv6 was merely in testing. We are now ready to call our IPv6 services production-ready.
Primarily, that means that our two route servers are working on IPv6, and are properly configured.
We encourage all connected networks to run dual stack of IPv4 and IPv6. We can also help with questions about how IPv6 devices should be configured, so please be bold. The MBIX-tech mailing list might be the best place to ask.
Finally, thanks to HE.net for proving MBIX (AS16395) with free IPv6 transit, over the exchange fabric.