c.ns.gov has no CNAME records.
Question and response
Question
dig c.ns.gov. NS
Answer
The response has no answer records.
Authority
ns.gov. 264 SOA danica.ns.cloudflare.com. dns.cloudflare.com. 2398128147 10000 2400 604800 1800
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0