mynah.chezaubert.net has no CNAME records.
Question and response
Question
dig mynah.chezaubert.net. NS
Answer
The response has no answer records.
Authority
chezaubert.net. 2920 SOA dove.chezaubert.net. jack.chezaubert.net. 1345 21600 1800 1814000 3600
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0