Apex domains cannot have CNAME records.
Question and response
Question
dig awsdns-38.net. NS
Answer
awsdns-38.net. 5 NS g-ns-808.awsdns-38.net.
awsdns-38.net. 5 NS g-ns-1382.awsdns-38.net.
awsdns-38.net. 5 NS g-ns-1958.awsdns-38.net.
awsdns-38.net. 5 NS g-ns-487.awsdns-38.net.
Authority
The response has no authority records.
Additional
g-ns-487.awsdns-38.net. 5 A 205.251.193.231
g-ns-808.awsdns-38.net. 5 A 205.251.195.40
g-ns-1382.awsdns-38.net. 5 A 205.251.197.102
g-ns-1958.awsdns-38.net. 5 A 205.251.199.166
g-ns-487.awsdns-38.net. 5 AAAA 2600:9000:5301:e700:0:0:0:1
g-ns-808.awsdns-38.net. 5 AAAA 2600:9000:5303:2800:0:0:0:1
g-ns-1382.awsdns-38.net. 5 AAAA 2600:9000:5305:6600:0:0:0:1
g-ns-1958.awsdns-38.net. 5 AAAA 2600:9000:5307:a600:0:0:0:1
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0