corwin.lubman.pl has no CNAME records.
Question and response
Question
dig corwin.lubman.pl. NS
Answer
The response has no answer records.
Authority
lubman.pl. 6509 SOA ns1.lublin.pl. dns.man.lublin.pl. 2024062759 14400 7200 2592000 86400
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0