ns4.dnetnoc.net has no CNAME records.
Question and response
Question
dig ns4.dnetnoc.net. NS
Answer
The response has no answer records.
Authority
dnetnoc.net. 766 SOA darl.ns.cloudflare.com. dns.cloudflare.com. 2395898790 10000 2400 604800 1800
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0