mail.ostendis.ch has no NS records.
NS records for this zone are defined at ostendis.ch.
NS records for this zone are defined at ostendis.ch.
Question and response
Question
dig mail.ostendis.ch. NS
Answer
The response has no answer records.
Authority
ostendis.ch. 300 SOA ch.ch-inter.net. philippe\.moser.gmx.net. 2025091101 3600 1800 604800 300
Additional
. 0 OPT ; payload 4096, xrcode 0, version 0, flags 0