b.registry.qa has no CNAME records.
Question and response
Question
dig b.registry.qa. NS
Answer
The response has no answer records.
Authority
registry.qa. 534 SOA ns1.registry.qa. sent.mail.to.tech.at.domains.qa. 2025120200 3600 300 604800 600
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0