amir.mx.cloudflare.net has no CNAME records.
Question and response
Question
dig amir.mx.cloudflare.net. NS
Answer
The response has no answer records.
Authority
mx.cloudflare.net. 1245 SOA arvind.ns.cloudflare.com. dns.cloudflare.com. 2396709336 10000 2400 604800 1800
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0