ntp.viarouge.net has no NS records.
NS records for this zone are defined at viarouge.net.
NS records for this zone are defined at viarouge.net.
Question and response
Question
dig ntp.viarouge.net. NS
Answer
The response has no answer records.
Authority
viarouge.net. 300 SOA dns1.name-services.com. info.name-services.com. 1773271317 172800 900 1814400 300
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0