Apex domains cannot have CNAME records.
Question and response
Question
dig prowebce.net. NS
Answer
prowebce.net. 2 NS ns-123-c.gandi.net.
prowebce.net. 2 NS ns-92-a.gandi.net.
prowebce.net. 2 NS ns-71-b.gandi.net.
Authority
The response has no authority records.
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0