Apex domains cannot have CNAME records.
Question and response
Question
dig awsdns-58.com. NS
Answer
awsdns-58.com. 3 NS g-ns-59.awsdns-58.com.
awsdns-58.com. 3 NS g-ns-1786.awsdns-58.com.
awsdns-58.com. 3 NS g-ns-1210.awsdns-58.com.
awsdns-58.com. 3 NS g-ns-634.awsdns-58.com.
Authority
The response has no authority records.
Additional
g-ns-59.awsdns-58.com. 3 A 205.251.192.59
g-ns-634.awsdns-58.com. 3 A 205.251.194.122
g-ns-1210.awsdns-58.com. 3 A 205.251.196.186
g-ns-1786.awsdns-58.com. 3 A 205.251.198.250
g-ns-59.awsdns-58.com. 3 AAAA 2600:9000:5300:3b00:0:0:0:1
g-ns-634.awsdns-58.com. 3 AAAA 2600:9000:5302:7a00:0:0:0:1
g-ns-1210.awsdns-58.com. 3 AAAA 2600:9000:5304:ba00:0:0:0:1
g-ns-1786.awsdns-58.com. 3 AAAA 2600:9000:5306:fa00:0:0:0:1
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0