Apex domains cannot have CNAME records.
Question and response
Question
dig stream. NS
Answer
stream. 5 NS c.nic.stream.
stream. 5 NS b.nic.stream.
stream. 5 NS ns2.dns.nic.stream.
stream. 5 NS ns3.dns.nic.stream.
stream. 5 NS a.nic.stream.
stream. 5 NS ns1.dns.nic.stream.
Authority
The response has no authority records.
Additional
a.nic.stream. 126070 A 37.209.192.10
b.nic.stream. 126070 A 37.209.194.10
c.nic.stream. 126070 A 37.209.196.10
ns1.dns.nic.stream. 166711 A 156.154.169.50
ns2.dns.nic.stream. 157204 A 156.154.170.50
ns3.dns.nic.stream. 162186 A 156.154.171.50
a.nic.stream. 126070 AAAA 2001:dcd:1:0:0:0:0:10
b.nic.stream. 126070 AAAA 2001:dcd:2:0:0:0:0:10
c.nic.stream. 126070 AAAA 2001:dcd:3:0:0:0:0:10
ns1.dns.nic.stream. 166711 AAAA 2610:a1:1071:0:0:0:1:32
ns2.dns.nic.stream. 157204 AAAA 2610:a1:1072:0:0:0:1:32
ns3.dns.nic.stream. 162186 AAAA 2610:a1:1073:0:0:0:1:32
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0