dns2.dataspace.pl has no CNAME records.
Question and response
Question
dig dns2.dataspace.pl. NS
Answer
The response has no answer records.
Authority
dataspace.pl. 1353 SOA dns1.dataspace.pl. dns.dataspace.pl. 1772636412 86400 7200 3600000 86400
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0