b.nic.host has no CNAME records.
Question and response
Question
dig b.nic.host. NS
Answer
The response has no answer records.
Authority
nic.host. 1872 SOA ns0.centralnic-dns.com. hostmaster.centralnic-dns.com. 1730172816 300 300 604800 3600
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0