Apex domains cannot have CNAME records.
Question and response
Question
dig nic.management. NS
Answer
nic.management. 5 NS v2n0.nic.management.
nic.management. 5 NS v0n1.nic.management.
nic.management. 5 NS v0n0.nic.management.
nic.management. 5 NS v0n2.nic.management.
nic.management. 5 NS v0n3.nic.management.
nic.management. 5 NS v2n1.nic.management.
Authority
The response has no authority records.
Additional
v0n0.nic.management. 138233 A 65.22.20.14
v0n1.nic.management. 39169 A 65.22.21.14
v0n2.nic.management. 31973 A 65.22.22.14
v0n3.nic.management. 62027 A 161.232.10.14
v2n0.nic.management. 31973 A 65.22.23.14
v2n1.nic.management. 31973 A 161.232.11.14
v0n0.nic.management. 138233 AAAA 2a01:8840:16:0:0:0:0:14
v0n1.nic.management. 39169 AAAA 2a01:8840:17:0:0:0:0:14
v0n2.nic.management. 31973 AAAA 2a01:8840:18:0:0:0:0:14
v0n3.nic.management. 62027 AAAA 2a01:8840:f4:0:0:0:0:14
v2n0.nic.management. 31973 AAAA 2a01:8840:19:0:0:0:0:14
v2n1.nic.management. 31973 AAAA 2a01:8840:f5:0:0:0:0:14
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0