Apex domains cannot have CNAME records.
Question and response
Question
dig glipac.io. NS
Answer
glipac.io. 4 NS anycast26.irondns.net.
glipac.io. 4 NS anycast104.irondns.eu.
Authority
The response has no authority records.
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0