Apex domains cannot have CNAME records.
Question and response
Question
dig iq.pl. NS
Answer
iq.pl. 5 NS ns2.iq.pl.
iq.pl. 5 NS ns3.iq.pl.
iq.pl. 5 NS ns1.iq.pl.
Authority
The response has no authority records.
Additional
ns1.iq.pl. 5 A 86.111.241.10
ns2.iq.pl. 5 A 87.98.237.225
ns3.iq.pl. 5 A 86.111.243.10
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0