Apex domains cannot have CNAME records.
Question and response
Question
dig intibs.pl. NS
Answer
intibs.pl. 5 NS dns.intibs.pl.
Authority
The response has no authority records.
Additional
dns.intibs.pl. 5 A 156.17.85.7
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0