Apex domains cannot have CNAME records.
Question and response
Question
dig awsdns-52.net. NS
Answer
awsdns-52.net. 5 NS g-ns-501.awsdns-52.net.
awsdns-52.net. 5 NS g-ns-1972.awsdns-52.net.
awsdns-52.net. 5 NS g-ns-1396.awsdns-52.net.
awsdns-52.net. 5 NS g-ns-822.awsdns-52.net.
Authority
The response has no authority records.
Additional
g-ns-501.awsdns-52.net. 5 A 205.251.193.245
g-ns-822.awsdns-52.net. 5 A 205.251.195.54
g-ns-1396.awsdns-52.net. 5 A 205.251.197.116
g-ns-1972.awsdns-52.net. 5 A 205.251.199.180
g-ns-501.awsdns-52.net. 5 AAAA 2600:9000:5301:f500:0:0:0:1
g-ns-822.awsdns-52.net. 5 AAAA 2600:9000:5303:3600:0:0:0:1
g-ns-1396.awsdns-52.net. 5 AAAA 2600:9000:5305:7400:0:0:0:1
g-ns-1972.awsdns-52.net. 5 AAAA 2600:9000:5307:b400:0:0:0:1
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0