Apex domains cannot have CNAME records.
Question and response
Question
dig nic.vi. NS
Answer
nic.vi. 5 NS pch.nic.vi.
nic.vi. 5 NS ns3.nic.vi.
Authority
The response has no authority records.
Additional
ns3.nic.vi. 117176 A 185.17.236.230
pch.nic.vi. 159946 A 204.61.216.133
pch.nic.vi. 159946 AAAA 2001:500:14:6133:ad:0:0:1
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0