https://blog.apnic.net/2016/05/04/you-have-ipv6-turn-it-on/ [apnic.net]
APNIC reminds us that "there are now a large number of ISPs, data centres, cloud services, and software that now support IPv6" and "enabling IPv6 can be as simple as clicking a button on your WiFi router."
I turned it on, with Comcast I received an IPv6 route but no DNS server. Fortunately, Google Public DNS has unmemorable addresses, which I was able to configure manually.
2001:4860:4860::8888
2001:4860:4860::8844
It works. "There’s only one thing left for you to do: Turn it on!"