dpmail.qs.datev.de has no NS records.
NS records for this zone are defined at qs.datev.de.
NS records for this zone are defined at qs.datev.de.
Question and response
Question
dig dpmail.qs.datev.de. NS
Answer
The response has no answer records.
Authority
qs.datev.de. 600 SOA ns01.datev.de. dnsmaster.datev.de. 2602251240 21600 3600 604800 600
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0