Apex domains cannot have CNAME records.
Question and response
Question
dig awsdns-30.org. NS
Answer
awsdns-30.org. 4 NS g-ns-1057.awsdns-30.org.
awsdns-30.org. 4 NS g-ns-1630.awsdns-30.org.
awsdns-30.org. 4 NS g-ns-158.awsdns-30.org.
awsdns-30.org. 4 NS g-ns-736.awsdns-30.org.
Authority
The response has no authority records.
Additional
g-ns-158.awsdns-30.org. 4 A 205.251.192.158
g-ns-736.awsdns-30.org. 4 A 205.251.194.224
g-ns-1057.awsdns-30.org. 4 A 205.251.196.33
g-ns-1630.awsdns-30.org. 4 A 205.251.198.94
g-ns-158.awsdns-30.org. 4 AAAA 2600:9000:5300:9e00:0:0:0:1
g-ns-736.awsdns-30.org. 4 AAAA 2600:9000:5302:e000:0:0:0:1
g-ns-1057.awsdns-30.org. 4 AAAA 2600:9000:5304:2100:0:0:0:1
g-ns-1630.awsdns-30.org. 4 AAAA 2600:9000:5306:5e00:0:0:0:1
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0