Apex domains cannot have CNAME records.
Question and response
Question
dig awsdns-00.net. NS
Answer
awsdns-00.net. 5 NS g-ns-770.awsdns-00.net.
awsdns-00.net. 5 NS g-ns-1344.awsdns-00.net.
awsdns-00.net. 5 NS g-ns-1920.awsdns-00.net.
awsdns-00.net. 5 NS g-ns-449.awsdns-00.net.
Authority
The response has no authority records.
Additional
g-ns-449.awsdns-00.net. 5 A 205.251.193.193
g-ns-770.awsdns-00.net. 5 A 205.251.195.2
g-ns-1344.awsdns-00.net. 5 A 205.251.197.64
g-ns-1920.awsdns-00.net. 5 A 205.251.199.128
g-ns-449.awsdns-00.net. 5 AAAA 2600:9000:5301:c100:0:0:0:1
g-ns-770.awsdns-00.net. 5 AAAA 2600:9000:5303:200:0:0:0:1
g-ns-1344.awsdns-00.net. 5 AAAA 2600:9000:5305:4000:0:0:0:1
g-ns-1920.awsdns-00.net. 5 AAAA 2600:9000:5307:8000:0:0:0:1
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0