Apex domains cannot have CNAME records.
Question and response
Question
dig awsdns-00.org. NS
Answer
awsdns-00.org. 5 NS g-ns-128.awsdns-00.org.
awsdns-00.org. 5 NS g-ns-706.awsdns-00.org.
awsdns-00.org. 5 NS g-ns-1027.awsdns-00.org.
awsdns-00.org. 5 NS g-ns-1600.awsdns-00.org.
Authority
The response has no authority records.
Additional
g-ns-128.awsdns-00.org. 5 A 205.251.192.128
g-ns-706.awsdns-00.org. 5 A 205.251.194.194
g-ns-1027.awsdns-00.org. 5 A 205.251.196.3
g-ns-1600.awsdns-00.org. 5 A 205.251.198.64
g-ns-128.awsdns-00.org. 5 AAAA 2600:9000:5300:8000:0:0:0:1
g-ns-706.awsdns-00.org. 5 AAAA 2600:9000:5302:c200:0:0:0:1
g-ns-1027.awsdns-00.org. 5 AAAA 2600:9000:5304:300:0:0:0:1
g-ns-1600.awsdns-00.org. 5 AAAA 2600:9000:5306:4000:0:0:0:1
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0