Apex domains cannot have CNAME records.
Question and response
Question
dig ptdes.net. NS
Answer
ptdes.net. 5 NS ns1.as45302.net.
ptdes.net. 5 NS hosting.ptdes.net.
Authority
The response has no authority records.
Additional
hosting.ptdes.net. 5 A 112.78.40.51
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0