thor.a2u2.com has no CNAME records.
Question and response
Question
dig thor.a2u2.com. NS
Answer
The response has no answer records.
Authority
a2u2.com. 3465 SOA odin.a2u2.com. dnsadmin.cyberlynk.net. 2026012100 10800 3600 604800 3600
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0