Apex domains cannot have CNAME records.
Question and response
Question
dig awsdns-36.net. NS
Answer
awsdns-36.net. 5 NS g-ns-485.awsdns-36.net.
awsdns-36.net. 5 NS g-ns-1380.awsdns-36.net.
awsdns-36.net. 5 NS g-ns-806.awsdns-36.net.
awsdns-36.net. 5 NS g-ns-1956.awsdns-36.net.
Authority
The response has no authority records.
Additional
g-ns-485.awsdns-36.net. 5 A 205.251.193.229
g-ns-806.awsdns-36.net. 5 A 205.251.195.38
g-ns-1380.awsdns-36.net. 5 A 205.251.197.100
g-ns-1956.awsdns-36.net. 5 A 205.251.199.164
g-ns-485.awsdns-36.net. 5 AAAA 2600:9000:5301:e500:0:0:0:1
g-ns-806.awsdns-36.net. 5 AAAA 2600:9000:5303:2600:0:0:0:1
g-ns-1380.awsdns-36.net. 5 AAAA 2600:9000:5305:6400:0:0:0:1
g-ns-1956.awsdns-36.net. 5 AAAA 2600:9000:5307:a400:0:0:0:1
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0