Apex domains cannot have CNAME records.
Question and response
Question
dig iwkd.pl. NS
Answer
iwkd.pl. 5 NS ns1.iwkd.pl.
iwkd.pl. 5 NS ns1.perfect-net.pl.
Authority
The response has no authority records.
Additional
ns1.iwkd.pl. 5 A 185.139.124.22
ns1.perfect-net.pl. 5 A 185.144.174.1
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0