b.ns.mt has no CNAME records.
Question and response
Question
dig b.ns.mt. NS
Answer
The response has no answer records.
Authority
mt. 10316 SOA a.ns.mt. tech.nic.org.mt. 2026022416 1800 900 604800 86400
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0