Apex domains cannot have CNAME records.
Question and response
Question
dig awsdns-47.org. NS
Answer
awsdns-47.org. 5 NS g-ns-753.awsdns-47.org.
awsdns-47.org. 5 NS g-ns-1074.awsdns-47.org.
awsdns-47.org. 5 NS g-ns-1647.awsdns-47.org.
awsdns-47.org. 5 NS g-ns-175.awsdns-47.org.
Authority
The response has no authority records.
Additional
g-ns-175.awsdns-47.org. 5 A 205.251.192.175
g-ns-753.awsdns-47.org. 5 A 205.251.194.241
g-ns-1074.awsdns-47.org. 5 A 205.251.196.50
g-ns-1647.awsdns-47.org. 5 A 205.251.198.111
g-ns-175.awsdns-47.org. 5 AAAA 2600:9000:5300:af00:0:0:0:1
g-ns-753.awsdns-47.org. 5 AAAA 2600:9000:5302:f100:0:0:0:1
g-ns-1074.awsdns-47.org. 5 AAAA 2600:9000:5304:3200:0:0:0:1
g-ns-1647.awsdns-47.org. 5 AAAA 2600:9000:5306:6f00:0:0:0:1
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0