smp.in.net.pl has no CNAME records.
Question and response
Question
dig smp.in.net.pl. NS
Answer
The response has no answer records.
Authority
in.net.pl. 1541 SOA ns1.idc.net.pl. dnsadmin.in.net.pl. 2026010800 28800 7200 604800 86400
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0