ns1.ptera.net has no CNAME records.
Question and response
Question
dig ns1.ptera.net. NS
Answer
The response has no answer records.
Authority
ptera.net. 916 SOA a.misconfigured.powerdns.server. hostmaster.ptera.net. 2022061402 10800 3600 604800 3600
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0