mailrelay.layer23.nl has no NS records.
NS records for this zone are defined at layer23.nl.
NS records for this zone are defined at layer23.nl.
Question and response
Question
dig mailrelay.layer23.nl. NS
Answer
The response has no answer records.
Authority
layer23.nl. 3600 SOA ns2.ip-security.nl. maarten.layer23.nl. 1704628871 10800 3600 604800 10800
Additional
. 0 OPT ; payload 4096, xrcode 0, version 0, flags 0