mx16.protectedservice.net has no CNAME records.
Question and response
Question
dig mx16.protectedservice.net. NS
Answer
The response has no answer records.
Authority
protectedservice.net. 10573 SOA ns0.nsserve.net. hostmaster.nsserve.net. 2026022501 28800 7200 604800 86400
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0