mx01.cyon.ch has no NS records.
NS records for this zone are defined at cyon.ch.
NS records for this zone are defined at cyon.ch.
Question and response
Question
dig mx01.cyon.ch. NS
Answer
The response has no answer records.
Authority
cyon.ch. 3600 SOA ns1.cyon.ch. server0.cyon.ch. 2024102205 14400 1800 604800 3600
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0