mail2.iwelt.de has no NS records.
NS records for this zone are defined at iwelt.de.
NS records for this zone are defined at iwelt.de.
Question and response
Question
dig mail2.iwelt.de. NS
Answer
The response has no answer records.
Authority
iwelt.de. 300 SOA dns.iwelt-ag.net. domainmaster.iwelt-ag.net. 2026021701 43200 3600 2419200 300
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0