mail.nicesrv.de has no NS records.
NS records for this zone are defined at nicesrv.de.
NS records for this zone are defined at nicesrv.de.
Question and response
Question
dig mail.nicesrv.de. NS
Answer
The response has no answer records.
Authority
nicesrv.de. 7200 SOA root-dns.netcup.net. dnsadmin.netcup.net. 2026022135 28800 7200 1209600 7200
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0