ns2.dynv6.com has no CNAME records.
Question and response
Question
dig ns2.dynv6.com. NS
Answer
The response has no answer records.
Authority
dynv6.com. 600 SOA ns1.digineo.de. hostmaster.digineo.de. 2026022106 86400 10800 604800 600
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0