Apex domains cannot have CNAME records.
Question and response
Question
dig awsdns-36.org. NS
Answer
awsdns-36.org. 5 NS g-ns-1636.awsdns-36.org.
awsdns-36.org. 5 NS g-ns-164.awsdns-36.org.
awsdns-36.org. 5 NS g-ns-742.awsdns-36.org.
awsdns-36.org. 5 NS g-ns-1063.awsdns-36.org.
Authority
The response has no authority records.
Additional
g-ns-164.awsdns-36.org. 5 A 205.251.192.164
g-ns-742.awsdns-36.org. 5 A 205.251.194.230
g-ns-1063.awsdns-36.org. 5 A 205.251.196.39
g-ns-1636.awsdns-36.org. 5 A 205.251.198.100
g-ns-164.awsdns-36.org. 5 AAAA 2600:9000:5300:a400:0:0:0:1
g-ns-742.awsdns-36.org. 5 AAAA 2600:9000:5302:e600:0:0:0:1
g-ns-1063.awsdns-36.org. 5 AAAA 2600:9000:5304:2700:0:0:0:1
g-ns-1636.awsdns-36.org. 5 AAAA 2600:9000:5306:6400:0:0:0:1
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0