Q: Can you put IPV6 addresses for name servers?
A: Yes, you can only enter one type (IP address or hostname) for a primary name server and since they have hostnames, that's probably the type they should use (as hostnames can resolve to either IP address type). The UI will accept either IPv4 or IPv6 addresses as a name server as well. Currently we do not support IPv6 as primary name server for secondary zones.