smtp.maxcluster.de has no NS records.
NS records for this zone are defined at maxcluster.de.
NS records for this zone are defined at maxcluster.de.
Question and response
Question
dig smtp.maxcluster.de. NS
Answer
The response has no answer records.
Authority
maxcluster.de. 3600 SOA nameserver-1-de.maxcluster.net. info.maxcluster.net. 2025112401 10800 3600 604800 3600
Additional
. 0 OPT ; payload 1680, xrcode 0, version 0, flags 0