Apex domains cannot have CNAME records.
Question and response
Question
dig hosted-by-worldstream.net. NS
Answer
hosted-by-worldstream.net. 5 NS ns1.worldstream.nl.
hosted-by-worldstream.net. 5 NS ns2.worldstream.com.
hosted-by-worldstream.net. 5 NS ns3.worldstream.net.
Authority
The response has no authority records.
Additional
ns1.worldstream.nl. 5 A 185.21.63.49
ns2.worldstream.com. 5 A 185.182.192.8
ns3.worldstream.net. 5 A 23.109.249.236
ns1.worldstream.nl. 5 AAAA 2a00:7c80:f000:ff41:0:0:0:41
ns2.worldstream.com. 5 AAAA 2a00:7c80:f000:aa11:0:0:0:11
ns3.worldstream.net. 5 AAAA 2a05:93c4:46:0:0:0:0:46
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0