Apex domains cannot have CNAME records.
Question and response
Question
dig herbsonline.net. NS
Answer
herbsonline.net. 5 NS ns-1461.awsdns-54.org.
herbsonline.net. 5 NS ns-574.awsdns-07.net.
herbsonline.net. 5 NS ns-724.awsdns-26.net.
herbsonline.net. 5 NS ns-1633.awsdns-12.co.uk.
Authority
The response has no authority records.
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0