mic-hs3.gastuna.com has no CNAME records.
Question and response
Question
dig mic-hs3.gastuna.com. NS
Answer
The response has no answer records.
Authority
gastuna.com. 9902 SOA ns1.gastuna.com. hostmaster.gastuna.com. 2025092617 28800 7200 604800 86400
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0