mail.bestsrv.de has no NS records.
NS records for this zone are defined at bestsrv.de.
NS records for this zone are defined at bestsrv.de.
Question and response
Question
dig mail.bestsrv.de. NS
Answer
The response has no answer records.
Authority
bestsrv.de. 86400 SOA root-dns.netcup.net. dnsadmin.netcup.net. 2026030243 28800 7200 1209600 86400
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0