Apex domains cannot have CNAME records.
Question and response
Question
dig awsdns-47.net. NS
Answer
awsdns-47.net. 5 NS g-ns-496.awsdns-47.net.
awsdns-47.net. 5 NS g-ns-1391.awsdns-47.net.
awsdns-47.net. 5 NS g-ns-817.awsdns-47.net.
awsdns-47.net. 5 NS g-ns-1967.awsdns-47.net.
Authority
The response has no authority records.
Additional
g-ns-496.awsdns-47.net. 5 A 205.251.193.240
g-ns-817.awsdns-47.net. 5 A 205.251.195.49
g-ns-1391.awsdns-47.net. 5 A 205.251.197.111
g-ns-1967.awsdns-47.net. 5 A 205.251.199.175
g-ns-496.awsdns-47.net. 5 AAAA 2600:9000:5301:f000:0:0:0:1
g-ns-817.awsdns-47.net. 5 AAAA 2600:9000:5303:3100:0:0:0:1
g-ns-1391.awsdns-47.net. 5 AAAA 2600:9000:5305:6f00:0:0:0:1
g-ns-1967.awsdns-47.net. 5 AAAA 2600:9000:5307:af00:0:0:0:1
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0