Apex domains cannot have CNAME records.
Question and response
Question
dig ipacs.pro. NS
Answer
ipacs.pro. 5 NS ns-142-b.gandi.net.
ipacs.pro. 5 NS ns-90-a.gandi.net.
ipacs.pro. 5 NS ns-149-c.gandi.net.
Authority
The response has no authority records.
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0