mx.dbvonline.de has no NS records.
NS records for this zone are defined at dbvonline.de.
NS records for this zone are defined at dbvonline.de.
Question and response
Question
dig mx.dbvonline.de. NS
Answer
The response has no answer records.
Authority
dbvonline.de. 3600 SOA dns.iwelt-ag.net. domainmaster.iwelt-ag.net. 2025051402 43200 3600 2419200 3600
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0