mt1.prometeus.net has no NS records.
NS records for this zone are defined at prometeus.net.
NS records for this zone are defined at prometeus.net.
Question and response
Question
dig mt1.prometeus.net. NS
Answer
The response has no answer records.
Authority
prometeus.net. 3600 SOA ns1.prometeus.net. sysadmin.prometeus.com. 905336226 10800 3600 604800 86400
Additional
. 0 OPT ; payload 2800, xrcode 0, version 0, flags 0