Apex domains cannot have CNAME records.
Question and response
Question
dig awsdns-49.net. NS
Answer
awsdns-49.net. 5 NS g-ns-1969.awsdns-49.net.
awsdns-49.net. 5 NS g-ns-498.awsdns-49.net.
awsdns-49.net. 5 NS g-ns-819.awsdns-49.net.
awsdns-49.net. 5 NS g-ns-1393.awsdns-49.net.
Authority
The response has no authority records.
Additional
g-ns-498.awsdns-49.net. 5 A 205.251.193.242
g-ns-819.awsdns-49.net. 5 A 205.251.195.51
g-ns-1393.awsdns-49.net. 5 A 205.251.197.113
g-ns-1969.awsdns-49.net. 5 A 205.251.199.177
g-ns-498.awsdns-49.net. 5 AAAA 2600:9000:5301:f200:0:0:0:1
g-ns-819.awsdns-49.net. 5 AAAA 2600:9000:5303:3300:0:0:0:1
g-ns-1393.awsdns-49.net. 5 AAAA 2600:9000:5305:7100:0:0:0:1
g-ns-1969.awsdns-49.net. 5 AAAA 2600:9000:5307:b100:0:0:0:1
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0