Apex domains cannot have CNAME records.
Question and response
Question
dig techmedia.com.pl. NS
Answer
techmedia.com.pl. 5 NS ns2.techmedia.com.pl.
techmedia.com.pl. 5 NS ns1.techmedia.com.pl.
Authority
The response has no authority records.
Additional
ns1.techmedia.com.pl. 5 A 91.192.0.12
ns2.techmedia.com.pl. 5 A 91.192.0.2
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0