sfe02.mdl.net has no NS records.
NS records for this zone are defined at mdl.net.
NS records for this zone are defined at mdl.net.
Question and response
Question
dig sfe02.mdl.net. NS
Answer
The response has no answer records.
Authority
mdl.net. 3600 SOA sfe01.mdl.net. hotline.mdl.net. 2025043015 3600 600 1209600 3600
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0