ns2.es.vodafone.nl has no NS records.
NS records for this zone are defined at es.vodafone.nl.
NS records for this zone are defined at es.vodafone.nl.
Question and response
Question
dig ns2.es.vodafone.nl. NS
Answer
The response has no answer records.
Authority
es.vodafone.nl. 3600 SOA ns1.es.vodafone.nl. esservicedesk\.nl.vodafone.com. 2010091788 10800 3600 2419200 3600
Additional
. 0 OPT ; payload 1220, xrcode 0, version 0, flags 0