Apex domains cannot have CNAME records.
Question and response
Question
dig serverology.net. NS
Answer
serverology.net. 5 NS ns-705.awsdns-24.net.
serverology.net. 5 NS ns-1827.awsdns-36.co.uk.
serverology.net. 5 NS ns-1355.awsdns-41.org.
serverology.net. 5 NS ns-1828.awsdns-36.co.uk.
Authority
The response has no authority records.
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0