mail.heiner-mail.de has no NS records.
NS records for this zone are defined at heiner-mail.de.
NS records for this zone are defined at heiner-mail.de.
Question and response
Question
dig mail.heiner-mail.de. NS
Answer
The response has no answer records.
Authority
heiner-mail.de. 3600 SOA ns1.ntdns.de. hostmaster.fastit.net. 2025063022 10800 3600 604800 3600
Additional
. 0 OPT ; payload 1680, xrcode 0, version 0, flags 0