Apex domains cannot have CNAME records.
Question and response
Question
dig dtlan.net. NS
Answer
dtlan.net. 5 NS ns-545.awsdns-04.net.
dtlan.net. 5 NS ns-1271.awsdns-30.org.
dtlan.net. 5 NS ns-2019.awsdns-60.co.uk.
dtlan.net. 5 NS ns-248.awsdns-31.com.
Authority
The response has no authority records.
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0