mx2.ri-server.de has no NS records.
NS records for this zone are defined at ri-server.de.
NS records for this zone are defined at ri-server.de.
Question and response
Question
dig mx2.ri-server.de. NS
Answer
The response has no answer records.
Authority
ri-server.de. 43200 SOA a.ns14.net. baader.rundblick.de. 2026012300 43200 14400 604800 43200
Additional
. 0 OPT ; payload 1220, xrcode 0, version 0, flags 0