Apex domains cannot have CNAME records.
Question and response
Question
dig pop586.com. NS
Answer
pop586.com. 5 NS ns-983.awsdns-58.net.
pop586.com. 5 NS ns-720.awsdns-26.net.
pop586.com. 5 NS ns-1291.awsdns-33.org.
pop586.com. 5 NS ns-1035.awsdns-01.org.
Authority
The response has no authority records.
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0