Apex domains cannot have CNAME records.
Question and response
Question
dig lp.pl. NS
Answer
lp.pl. 4 NS ns1.lp.pl.
lp.pl. 4 NS ns2.lp.pl.
Authority
The response has no authority records.
Additional
ns1.lp.pl. 4 A 194.1.144.29
ns2.lp.pl. 4 A 194.1.144.30
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0