Apex domains cannot have CNAME records.
Question and response
Question
dig quantil.com. NS
Answer
quantil.com. 2 NS dns2.speedws.info.
quantil.com. 2 NS dns5.speedws.org.
quantil.com. 2 NS dns1.speedws.org.
quantil.com. 2 NS dns3.speedws.org.
quantil.com. 2 NS dns4.speedws.info.
Authority
The response has no authority records.
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0