dworkin.mnc.pl has no CNAME records.
Question and response
Question
dig dworkin.mnc.pl. NS
Answer
The response has no answer records.
Authority
mnc.pl. 10800 SOA ns1.tpnets.com. dns.tpnets.com. 2025102301 43200 3600 1209600 86400
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0