Apex domains cannot have CNAME records.
Question and response
Question
dig radiantcore.info. NS
Answer
radiantcore.info. 5 NS ns-1150.awsdns-15.org.
radiantcore.info. 5 NS ns-774.awsdns-32.net.
radiantcore.info. 5 NS ns-65.awsdns-08.com.
radiantcore.info. 5 NS ns-1107.awsdns-10.org.
Authority
The response has no authority records.
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0