dns.smart has no CNAME records.
Question and response
Question
dig dns.smart. NS
Answer
The response has no answer records.
Authority
smart. 839 SOA ns0.centralnic.net. hostmaster.centralnic.net. 1773144313 60 1800 6048000 3600
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0