mailfilter1.xs4all.be has no NS records.
NS records for this zone are defined at xs4all.be.
NS records for this zone are defined at xs4all.be.
Question and response
Question
dig mailfilter1.xs4all.be. NS
Answer
The response has no answer records.
Authority
xs4all.be. 28800 SOA ns1.evonet.be. hostmaster.evonet.be. 2025111401 21600 7200 2419200 86400
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0