Apex domains cannot have CNAME records.
Question and response
Question
dig dataspace.pl. NS
Answer
dataspace.pl. 3 NS dns2.dataspace.pl.
dataspace.pl. 3 NS dns1.dataspace.pl.
Authority
The response has no authority records.
Additional
dns1.dataspace.pl. 3 A 195.177.217.184
dns2.dataspace.pl. 3 A 185.170.107.53
dns1.dataspace.pl. 3 AAAA 2a0b:5486:1000:1000:0:0:0:7
dns2.dataspace.pl. 3 AAAA 2a02:e7c0:0:200:0:0:0:4
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0