Apex domains cannot have CNAME records.
Question and response
Question
dig jchost.pl. NS
Answer
jchost.pl. 5 NS ns1.jchost18.pl.
jchost.pl. 5 NS ns2.jchost18.pl.
Authority
The response has no authority records.
Additional
ns1.jchost18.pl. 5 A 85.128.54.18
ns2.jchost18.pl. 5 A 85.128.55.18
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0