ns4.dhosting.pl has no CNAME records.
Question and response
Question
dig ns4.dhosting.pl. NS
Answer
The response has no answer records.
Authority
dhosting.pl. 10800 SOA ns1.dhosting.pl. root.dhosting.pl. 2026022505 21600 7200 1209600 86400
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0