Apex domains cannot have CNAME records.
Question and response
Question
dig ntcloudbox.com. NS
Answer
ntcloudbox.com. 3 NS ns4.totonline.net.
ntcloudbox.com. 3 NS ns3.totonline.net.
ntcloudbox.com. 3 NS ns1.totonline.net.
ntcloudbox.com. 3 NS ns2.totonline.net.
Authority
The response has no authority records.
Additional
ns1.totonline.net. 3 A 180.180.247.37
ns2.totonline.net. 3 A 118.174.8.115
ns3.totonline.net. 3 A 180.180.247.38
ns4.totonline.net. 3 A 118.174.8.116
ns1.totonline.net. 3 AAAA 2001:ec0:101:567:0:0:0:37
ns2.totonline.net. 3 AAAA 2001:ec0:120:9:0:0:0:3
ns3.totonline.net. 3 AAAA 2001:ec0:101:567:0:0:0:38
ns4.totonline.net. 3 AAAA 2001:ec0:120:9:0:0:0:4
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0