mail.supersrv.de has no NS records.
NS records for this zone are defined at supersrv.de.
NS records for this zone are defined at supersrv.de.
Question and response
Question
dig mail.supersrv.de. NS
Answer
The response has no answer records.
Authority
supersrv.de. 7200 SOA root-dns.netcup.net. dnsadmin.netcup.net. 2026031409 28800 7200 1209600 7200
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0