mail.ultrasrv.de has no NS records.
NS records for this zone are defined at ultrasrv.de.
NS records for this zone are defined at ultrasrv.de.
Question and response
Question
dig mail.ultrasrv.de. NS
Answer
The response has no answer records.
Authority
ultrasrv.de. 7200 SOA root-dns.netcup.net. dnsadmin.netcup.net. 2026032803 28800 7200 1209600 7200
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0