spamfilter.nexthost.nl has no NS records.
NS records for this zone are defined at nexthost.nl.
NS records for this zone are defined at nexthost.nl.
Question and response
Question
dig spamfilter.nexthost.nl. NS
Answer
The response has no answer records.
Authority
nexthost.nl. 3600 SOA ns01.nexthost.nl. hostmaster.nexthost.nl. 2025100800 3600 3600 1209600 86400
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0