exchange.ipsecur.nl has no NS records.
NS records for this zone are defined at ipsecur.nl.
NS records for this zone are defined at ipsecur.nl.
Question and response
Question
dig exchange.ipsecur.nl. NS
Answer
The response has no answer records.
Authority
ipsecur.nl. 3600 SOA ns1.ip-security.nl. maarten.ipsecur.nl. 1643743582 10800 3600 604800 10800
Additional
. 0 OPT ; payload 4096, xrcode 0, version 0, flags 0