Apex domains cannot have CNAME records.
Question and response
Question
dig cloudflare.net. NS
Answer
cloudflare.net. 5 NS ns2.cloudflare.net.
cloudflare.net. 5 NS ns3.cloudflare.net.
cloudflare.net. 5 NS ns1.cloudflare.net.
cloudflare.net. 5 NS ns5.cloudflare.net.
cloudflare.net. 5 NS ns4.cloudflare.net.
Authority
The response has no authority records.
Additional
ns1.cloudflare.net. 5 A 108.162.198.250
ns1.cloudflare.net. 5 A 162.159.60.250
ns1.cloudflare.net. 5 A 172.64.40.250
ns2.cloudflare.net. 5 A 108.162.198.251
ns2.cloudflare.net. 5 A 162.159.60.251
ns2.cloudflare.net. 5 A 172.64.40.251
ns3.cloudflare.net. 5 A 108.162.198.252
ns3.cloudflare.net. 5 A 162.159.60.252
ns3.cloudflare.net. 5 A 172.64.40.252
ns4.cloudflare.net. 5 A 108.162.198.253
ns4.cloudflare.net. 5 A 162.159.60.253
ns4.cloudflare.net. 5 A 172.64.40.253
ns5.cloudflare.net. 5 A 108.162.198.254
ns5.cloudflare.net. 5 A 162.159.60.254
ns5.cloudflare.net. 5 A 172.64.40.254
ns1.cloudflare.net. 5 AAAA 2606:4700:57:1:4e4b:27d7:a29f:3cfa
ns1.cloudflare.net. 5 AAAA 2803:f800:52:1:1df9:cfa1:ac40:28fa
ns1.cloudflare.net. 5 AAAA 2a06:98c1:56:1:2693:f8af:6ca2:c6fa
ns2.cloudflare.net. 5 AAAA 2606:4700:57:1:e6ea:b99c:a29f:3cfb
ns2.cloudflare.net. 5 AAAA 2803:f800:52:1:4da:414e:ac40:28fb
ns2.cloudflare.net. 5 AAAA 2a06:98c1:56:1:ca7d:4c29:6ca2:c6fb
ns3.cloudflare.net. 5 AAAA 2606:4700:57:1:cba:4d93:a29f:3cfc
ns3.cloudflare.net. 5 AAAA 2803:f800:52:1:b216:ccbe:ac40:28fc
ns3.cloudflare.net. 5 AAAA 2a06:98c1:56:1:2cfa:9492:6ca2:c6fc
ns4.cloudflare.net. 5 AAAA 2606:4700:57:1:fd14:b411:a29f:3cfd
ns4.cloudflare.net. 5 AAAA 2803:f800:52:1:e69e:46f0:ac40:28fd
ns4.cloudflare.net. 5 AAAA 2a06:98c1:56:1:45a3:de4a:6ca2:c6fd
ns5.cloudflare.net. 5 AAAA 2606:4700:57:1:cb7b:a51d:a29f:3cfe
ns5.cloudflare.net. 5 AAAA 2803:f800:52:1:d48b:2cd:ac40:28fe
ns5.cloudflare.net. 5 AAAA 2a06:98c1:56:1:3b6c:6602:6ca2:c6fe
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0