Apex domains cannot have CNAME records.
Question and response
Question
dig gawex.pl. NS
Answer
gawex.pl. 5 NS NS1.gawex.pl.
gawex.pl. 5 NS DNS.gawex.pl.
Authority
The response has no authority records.
Additional
dns.gawex.pl. 5 A 84.205.31.2
ns1.Gawex.PL. 5 A 89.239.127.9
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0