nsb.n0c.com has no CNAME records.
Question and response
Question
dig nsb.n0c.com. NS
Answer
The response has no answer records.
Authority
n0c.com. 1322 SOA nsa.n0c.com. hostmaster.n0c.com. 2026030711 10800 3600 604800 3600
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0