Apex domains cannot have CNAME records.
Question and response
Question
dig awsdns-05.org. NS
Answer
awsdns-05.org. 5 NS g-ns-1032.awsdns-05.org.
awsdns-05.org. 5 NS g-ns-133.awsdns-05.org.
awsdns-05.org. 5 NS g-ns-711.awsdns-05.org.
awsdns-05.org. 5 NS g-ns-1605.awsdns-05.org.
Authority
The response has no authority records.
Additional
g-ns-133.awsdns-05.org. 5 A 205.251.192.133
g-ns-711.awsdns-05.org. 5 A 205.251.194.199
g-ns-1032.awsdns-05.org. 5 A 205.251.196.8
g-ns-1605.awsdns-05.org. 5 A 205.251.198.69
g-ns-133.awsdns-05.org. 5 AAAA 2600:9000:5300:8500:0:0:0:1
g-ns-711.awsdns-05.org. 5 AAAA 2600:9000:5302:c700:0:0:0:1
g-ns-1032.awsdns-05.org. 5 AAAA 2600:9000:5304:800:0:0:0:1
g-ns-1605.awsdns-05.org. 5 AAAA 2600:9000:5306:4500:0:0:0:1
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0