Apex domains cannot have CNAME records.
Question and response
Question
dig awsdns-57.com. NS
Answer
awsdns-57.com. 5 NS g-ns-58.awsdns-57.com.
awsdns-57.com. 5 NS g-ns-1785.awsdns-57.com.
awsdns-57.com. 5 NS g-ns-1209.awsdns-57.com.
awsdns-57.com. 5 NS g-ns-633.awsdns-57.com.
Authority
The response has no authority records.
Additional
g-ns-58.awsdns-57.com. 5 A 205.251.192.58
g-ns-633.awsdns-57.com. 5 A 205.251.194.121
g-ns-1209.awsdns-57.com. 5 A 205.251.196.185
g-ns-1785.awsdns-57.com. 5 A 205.251.198.249
g-ns-58.awsdns-57.com. 5 AAAA 2600:9000:5300:3a00:0:0:0:1
g-ns-633.awsdns-57.com. 5 AAAA 2600:9000:5302:7900:0:0:0:1
g-ns-1209.awsdns-57.com. 5 AAAA 2600:9000:5304:b900:0:0:0:1
g-ns-1785.awsdns-57.com. 5 AAAA 2600:9000:5306:f900:0:0:0:1
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0