Apex domains cannot have CNAME records.
Question and response
Question
dig hostedrt.com. NS
Answer
hostedrt.com. 5 NS ns-38.awsdns-04.com.
hostedrt.com. 5 NS ns-1053.awsdns-03.org.
hostedrt.com. 5 NS ns-991.awsdns-59.net.
hostedrt.com. 5 NS ns-2037.awsdns-62.co.uk.
Authority
The response has no authority records.
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0