mail.d39s-mail.de has no NS records.
NS records for this zone are defined at d39s-mail.de.
NS records for this zone are defined at d39s-mail.de.
Question and response
Question
dig mail.d39s-mail.de. NS
Answer
The response has no answer records.
Authority
d39s-mail.de. 1800 SOA adel.ns.cloudflare.com. dns.cloudflare.com. 2398928868 10000 2400 604800 1800
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0