Apex domains cannot have CNAME records.
Question and response
Question
dig superloop.com. NS
Answer
superloop.com. 2 NS ns-215.awsdns-26.com.
superloop.com. 2 NS ns-1269.awsdns-30.org.
superloop.com. 2 NS ns-595.awsdns-10.net.
superloop.com. 2 NS ns-2002.awsdns-58.co.uk.
Authority
The response has no authority records.
Additional
ns-595.awsdns-10.net. 2 A 205.251.194.83
ns-1269.awsdns-30.org. 2 A 205.251.196.245
ns-2002.awsdns-58.co.uk. 2 A 205.251.199.210
ns-215.awsdns-26.com. 2 AAAA 2600:9000:5300:d700:0:0:0:1
ns-595.awsdns-10.net. 2 AAAA 2600:9000:5302:5300:0:0:0:1
ns-1269.awsdns-30.org. 2 AAAA 2600:9000:5304:f500:0:0:0:1
ns-2002.awsdns-58.co.uk. 2 AAAA 2600:9000:5307:d200:0:0:0:1
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0