Apex domains cannot have CNAME records.
Question and response
Question
dig nasze.pl. NS
Answer
nasze.pl. 5 NS plato.ksiezyc.pl.
nasze.pl. 5 NS alpha.nasze.pl.
Authority
The response has no authority records.
Additional
alpha.nasze.pl. 5 A 46.45.114.1
plato.ksiezyc.pl. 5 A 46.45.78.1
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0