smtp.xs4all.nl has no NS records.
NS records for this zone are defined at xs4all.nl.
NS records for this zone are defined at xs4all.nl.
Question and response
Question
dig smtp.xs4all.nl. NS
Answer
The response has no answer records.
Authority
xs4all.nl. 3600 SOA ns1.kpn.net. zonemaster.kpn.com. 2026031201 10800 3600 604800 3600
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0