Apex domains cannot have CNAME records.
Question and response
Question
dig is.cc. NS
Answer
is.cc. 5 NS josh.ns.cloudflare.com.
is.cc. 5 NS lucy.ns.cloudflare.com.
Authority
The response has no authority records.
Additional
lucy.ns.cloudflare.com. 2 A 108.162.192.133
lucy.ns.cloudflare.com. 2 A 172.64.32.133
lucy.ns.cloudflare.com. 2 A 173.245.58.133
lucy.ns.cloudflare.com. 2 AAAA 2606:4700:50:0:0:0:adf5:3a85
lucy.ns.cloudflare.com. 2 AAAA 2803:f800:50:0:0:0:6ca2:c085
lucy.ns.cloudflare.com. 2 AAAA 2a06:98c1:50:0:0:0:ac40:2085
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0