Apex domains cannot have CNAME records.
Question and response
Question
dig vtoasp.com. NS
Answer
vtoasp.com. 5 NS ns2.namesystem.se.
vtoasp.com. 5 NS ns3.namesystem.se.
vtoasp.com. 5 NS ns1.namesystem.se.
Authority
The response has no authority records.
Additional
ns1.namesystem.se. 5 A 195.238.76.18
ns2.namesystem.se. 5 A 195.238.77.18
ns3.namesystem.se. 5 A 195.20.206.18
ns1.namesystem.se. 5 AAAA 2a02:750:aaaa:0:0:0:0:1
ns2.namesystem.se. 5 AAAA 2a02:750:aaaa:0:0:0:0:2
ns3.namesystem.se. 5 AAAA 2a02:750:aaaa:0:0:0:0:3
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0