When I set up my new server and moved my DNS records to my name registrar, I also included records for my server’s IPv6 address (2600:3c00::f03c:91ff:fecf:250d), as well as the familiar IPv4 address (18.104.22.168). Supporting both is known as dual stack.
I didn’t have to support IPv6 since I do have an IPv4 address, but if I’m going to do the shiny new with my site, I’m going to go shiny, new all the way.
Besides, there’s no more room at the inn with the old IPv4 system. We’ve run out of web addresses under the old IPv4 addressing system. The current IPv4 system only allows for 4.3 billion addressed, and they’ve all been assigned.
Yeah, haven’t we been prolific on the web.