Apex domains cannot have CNAME records.
Question and response
Question
dig awsdns-17.net. NS
Answer
awsdns-17.net. 5 NS g-ns-787.awsdns-17.net.
awsdns-17.net. 5 NS g-ns-1937.awsdns-17.net.
awsdns-17.net. 5 NS g-ns-466.awsdns-17.net.
awsdns-17.net. 5 NS g-ns-1361.awsdns-17.net.
Authority
The response has no authority records.
Additional
g-ns-466.awsdns-17.net. 5 A 205.251.193.210
g-ns-787.awsdns-17.net. 5 A 205.251.195.19
g-ns-1361.awsdns-17.net. 5 A 205.251.197.81
g-ns-1937.awsdns-17.net. 5 A 205.251.199.145
g-ns-466.awsdns-17.net. 5 AAAA 2600:9000:5301:d200:0:0:0:1
g-ns-787.awsdns-17.net. 5 AAAA 2600:9000:5303:1300:0:0:0:1
g-ns-1361.awsdns-17.net. 5 AAAA 2600:9000:5305:5100:0:0:0:1
g-ns-1937.awsdns-17.net. 5 AAAA 2600:9000:5307:9100:0:0:0:1
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0