Apex domains cannot have CNAME records.
Question and response
Question
dig awsdns-cn-08.net. NS
Answer
awsdns-cn-08.net. 3 NS g-ns-2345.awsdns-cn-08.net.
awsdns-cn-08.net. 3 NS g-ns-intl-681.awsdns-cn-08.net.
awsdns-cn-08.net. 3 NS g-ns-1701.awsdns-cn-08.net.
awsdns-cn-08.net. 3 NS g-ns-intl-3232.awsdns-cn-08.net.
awsdns-cn-08.net. 3 NS g-ns-681.awsdns-cn-08.net.
awsdns-cn-08.net. 3 NS g-ns-3232.awsdns-cn-08.net.
Authority
The response has no authority records.
Additional
g-ns-681.awsdns-cn-08.net. 3 A 52.82.178.169
g-ns-1701.awsdns-cn-08.net. 3 A 52.82.182.165
g-ns-2345.awsdns-cn-08.net. 3 A 54.222.33.41
g-ns-3232.awsdns-cn-08.net. 3 A 54.222.36.160
g-ns-intl-681.awsdns-cn-08.net. 3 A 52.46.186.169
g-ns-intl-3232.awsdns-cn-08.net. 3 A 52.46.180.160
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0