Apex domains cannot have CNAME records.
Question and response
Question
dig awsdns-58.net. NS
Answer
awsdns-58.net. 5 NS g-ns-1978.awsdns-58.net.
awsdns-58.net. 5 NS g-ns-507.awsdns-58.net.
awsdns-58.net. 5 NS g-ns-828.awsdns-58.net.
awsdns-58.net. 5 NS g-ns-1402.awsdns-58.net.
Authority
The response has no authority records.
Additional
g-ns-507.awsdns-58.net. 5 A 205.251.193.251
g-ns-828.awsdns-58.net. 5 A 205.251.195.60
g-ns-1402.awsdns-58.net. 5 A 205.251.197.122
g-ns-1978.awsdns-58.net. 5 A 205.251.199.186
g-ns-507.awsdns-58.net. 5 AAAA 2600:9000:5301:fb00:0:0:0:1
g-ns-828.awsdns-58.net. 5 AAAA 2600:9000:5303:3c00:0:0:0:1
g-ns-1402.awsdns-58.net. 5 AAAA 2600:9000:5305:7a00:0:0:0:1
g-ns-1978.awsdns-58.net. 5 AAAA 2600:9000:5307:ba00:0:0:0:1
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0