cm.cleanmail.ch has no NS records.
NS records for this zone are defined at cleanmail.ch.
NS records for this zone are defined at cleanmail.ch.
Question and response
Question
dig cm.cleanmail.ch. NS
Answer
The response has no answer records.
Authority
cleanmail.ch. 7200 SOA ns3.cleanmail.ch. hostmaster.cleanmail.ch. 2025121803 86400 7200 3600000 7200
Additional
. 0 OPT ; payload 1280, xrcode 0, version 0, flags 0