Let's start at the #DNS. Obviously, the root is fully dual-stack, but what about the TLDs? Overall, that's not terrible: only 18 of the 1,436 TLDs have only IPv4-only NS records in the root zone, although 240 TLDs have at least one IPv4-only NS. But for the top 1M _second-level_ domains, this already drops down and only around 72% of them have at least one IPv6-enabled NS. #ipv6