dns1.thzhost.com has no CNAME records.
Question and response
Question
dig dns1.thzhost.com. NS
Answer
The response has no answer records.
Authority
thzhost.com. 461 SOA dns1.thzhost.com. dnsadmin.thzhost.com. 2026022402 3600 3600 604800 3600
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0