mx.icip.de has no NS records.
NS records for this zone are defined at icip.de.
NS records for this zone are defined at icip.de.
Question and response
Question
dig mx.icip.de. NS
Answer
The response has no answer records.
Authority
icip.de. 60 SOA ns10.icip.de. hostmaster.icip.de. 2026022201 3600 300 604800 10800
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0