b.nic.stream has no CNAME records.
Question and response
Question
dig b.nic.stream. NS
Answer
The response has no answer records.
Authority
nic.stream. 583 SOA ns1.dns.nic.stream. admin.tldns.godaddy. 1771947687 1800 300 604800 1800
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0