h02p01.smtp.routit.net has no NS records.
NS records for this zone are defined at smtp.routit.net.
NS records for this zone are defined at smtp.routit.net.
Question and response
Question
dig h02p01.smtp.routit.net. NS
Answer
The response has no answer records.
Authority
smtp.routit.net. 900 SOA auth01-peer.ib.routit.net. noc.routit.nl. 151 1800 900 604800 900
Additional
. 0 OPT ; payload 1220, xrcode 0, version 0, flags 0