web403.shellrent.com has no CNAME records.
Question and response
Question
dig web403.shellrent.com. NS
Answer
The response has no answer records.
Authority
shellrent.com. 1675 SOA ada.ns.cloudflare.com. dns.cloudflare.com. 2397011409 10000 2400 604800 1800
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0