Apex domains cannot have CNAME records.
Question and response
Question
dig encomu.cat. NS
Answer
encomu.cat. 5 NS dns110.ovh.net.
encomu.cat. 5 NS ns110.ovh.net.
Authority
The response has no authority records.
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0