Apex domains cannot have CNAME records.
Question and response
Question
dig awsdns-06.org. NS
Answer
awsdns-06.org. 5 NS g-ns-1033.awsdns-06.org.
awsdns-06.org. 5 NS g-ns-1606.awsdns-06.org.
awsdns-06.org. 5 NS g-ns-134.awsdns-06.org.
awsdns-06.org. 5 NS g-ns-712.awsdns-06.org.
Authority
The response has no authority records.
Additional
g-ns-134.awsdns-06.org. 5 A 205.251.192.134
g-ns-712.awsdns-06.org. 5 A 205.251.194.200
g-ns-1033.awsdns-06.org. 5 A 205.251.196.9
g-ns-1606.awsdns-06.org. 5 A 205.251.198.70
g-ns-134.awsdns-06.org. 5 AAAA 2600:9000:5300:8600:0:0:0:1
g-ns-712.awsdns-06.org. 5 AAAA 2600:9000:5302:c800:0:0:0:1
g-ns-1033.awsdns-06.org. 5 AAAA 2600:9000:5304:900:0:0:0:1
g-ns-1606.awsdns-06.org. 5 AAAA 2600:9000:5306:4600:0:0:0:1
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0