mx.as2.ch has no NS records.
NS records for this zone are defined at as2.ch.
NS records for this zone are defined at as2.ch.
Question and response
Question
dig mx.as2.ch. NS
Answer
The response has no answer records.
Authority
as2.ch. 10800 SOA ns1.as2.ch. info.as2.ch. 2025112101 10800 3600 604800 10800
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0