slv2.schlund.de has no NS records.
NS records for this zone are defined at schlund.de.
NS records for this zone are defined at schlund.de.
Question and response
Question
dig slv2.schlund.de. NS
Answer
The response has no answer records.
Authority
schlund.de. 600 SOA rns.ui-dns.de. dnsadmin.1und1.de. 2013105228 10800 3600 604800 600
Additional
. 0 OPT ; payload 1220, xrcode 0, version 0, flags 0