Country: Germany
ISP: Unitymedia (cable)
IPv6: fully functional and anatomically correct
IPv4: DSlite, no port forwarding neither with UPNP nor manual
Beta: no (sadly)
* For over a year new, Telekom connections have been Dual Stack (IP only by default, no POTS). Existing contracts like mine which still have POTS telephone connections are IPv4 only. Apparently it's proper dual stack, not DS-Lite, because Telekom are sitting on a large pile of IPv4 addresses. Here's a post from Telekom explaining some of the above: https://telekomhilft.telekom.de/t5/...-dual-stack-ipv4-und-ipv6/m-p/1642752#M100846