www.pbw.pl has no CNAME records.
Question and response
Question
dig www.pbw.pl. NS
Answer
The response has no answer records.
Authority
pbw.pl. 3013 SOA ns1.premium.pl. admin.premium.pl. 918294251 14400 7200 2419200 3600
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0