Apex domains cannot have CNAME records.
Question and response
Question
dig awsdns-58.org. NS
Answer
awsdns-58.org. 5 NS g-ns-764.awsdns-58.org.
awsdns-58.org. 5 NS g-ns-1658.awsdns-58.org.
awsdns-58.org. 5 NS g-ns-186.awsdns-58.org.
awsdns-58.org. 5 NS g-ns-1085.awsdns-58.org.
Authority
The response has no authority records.
Additional
g-ns-186.awsdns-58.org. 5 A 205.251.192.186
g-ns-764.awsdns-58.org. 5 A 205.251.194.252
g-ns-1085.awsdns-58.org. 5 A 205.251.196.61
g-ns-1658.awsdns-58.org. 5 A 205.251.198.122
g-ns-186.awsdns-58.org. 5 AAAA 2600:9000:5300:ba00:0:0:0:1
g-ns-764.awsdns-58.org. 5 AAAA 2600:9000:5302:fc00:0:0:0:1
g-ns-1085.awsdns-58.org. 5 AAAA 2600:9000:5304:3d00:0:0:0:1
g-ns-1658.awsdns-58.org. 5 AAAA 2600:9000:5306:7a00:0:0:0:1
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0