mx02.tophost.ch has no NS records.
NS records for this zone are defined at tophost.ch.
NS records for this zone are defined at tophost.ch.
Question and response
Question
dig mx02.tophost.ch. NS
Answer
The response has no answer records.
Authority
tophost.ch. 3600 SOA ns59.tophost.ch. admin.novatrend.ch. 2026030926 3600 1800 1209600 86400
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0