dpmail.pp.datev.de has no NS records.
NS records for this zone are defined at pp.datev.de.
NS records for this zone are defined at pp.datev.de.
Question and response
Question
dig dpmail.pp.datev.de. NS
Answer
The response has no answer records.
Authority
pp.datev.de. 600 SOA ns01.datev.de. dnsmaster.datev.de. 2602240039 21600 3600 604800 600
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0