dns3.iwelt-ag.de has no NS records.
NS records for this zone are defined at iwelt-ag.de.
NS records for this zone are defined at iwelt-ag.de.
Question and response
Question
dig dns3.iwelt-ag.de. NS
Answer
The response has no answer records.
Authority
iwelt-ag.de. 3600 SOA dns.iwelt-ag.net. domainmaster.iwelt-ag.net. 2018013004 43200 3600 2419200 3600
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0