Apex domains cannot have CNAME records.
Question and response
Question
dig powerfulsource.net. NS
Answer
powerfulsource.net. 5 NS ns-396.awsdns-49.com.
powerfulsource.net. 5 NS ns-146.awsdns-18.com.
powerfulsource.net. 5 NS ns-746.awsdns-29.net.
powerfulsource.net. 5 NS ns-490.awsdns-61.com.
Authority
The response has no authority records.
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0