[dns-operations] IPv6 only for nameservers

[Stephane Bortzmeyer]

On Mon, Dec 30, 2019 at 05:18:01PM +0300,
 Anand Buddhdev <anandb at ripe.net> wrote 
 a message of 17 lines which said:

> If your domain's authoritative name servers have only IPv6
> addresses, then your domain will not be resolvable by many resolvers
> on the Internet, because many of them only have IPv4 connectivity.

This was in 2014 but I'm not sure it changed a lot since:

https://labs.ripe.net/Members/stephane_bortzmeyer/how-many-ripe-atlas-probes-can-resolve-ipv6-only-domain-names