ntmx.ntcloudbox.com has no NS records.
NS records for this zone are defined at ntcloudbox.com.
NS records for this zone are defined at ntcloudbox.com.
Question and response
Question
dig ntmx.ntcloudbox.com. NS
Answer
The response has no answer records.
Authority
ntcloudbox.com. 900 SOA ns1.totonline.net. please_set_email.absolutely.nowhere. 285 10800 3600 2419200 900
Additional
. 0 OPT ; payload 1220, xrcode 0, version 0, flags 0