encrypt201.appriver.com has no CNAME records.
Question and response
Question
dig encrypt201.appriver.com. NS
Answer
The response has no answer records.
Authority
appriver.com. 1758 SOA hugh.ns.cloudflare.com. dns.cloudflare.com. 2397775889 10000 2400 604800 1800
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0