ns3.sdu.dk has no NS records.
NS records for this zone are defined at sdu.dk.
NS records for this zone are defined at sdu.dk.
Question and response
Question
dig ns3.sdu.dk. NS
Answer
The response has no answer records.
Authority
sdu.dk. 900 SOA ns1.sdu.dk. dns.sdu.dk. 2012273662 86400 7200 2419200 900
Additional
. 0 OPT ; payload 1220, xrcode 0, version 0, flags 0