lb2-smtp-cloud9.xs4all.net has no NS records.
NS records for this zone are defined at xs4all.net.
NS records for this zone are defined at xs4all.net.
Question and response
Question
dig lb2-smtp-cloud9.xs4all.net. NS
Answer
The response has no answer records.
Authority
xs4all.net. 3600 SOA ns1.kpn.net. zonemaster.kpn.com. 2026031901 10800 3600 604800 3600
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0