mailserver.martinahautau.de has no NS records.
NS records for this zone are defined at martinahautau.de.
NS records for this zone are defined at martinahautau.de.
Question and response
Question
dig mailserver.martinahautau.de. NS
Answer
The response has no answer records.
Authority
martinahautau.de. 7200 SOA ns5.kasserver.com. hostmaster.kasserver.com. 2603041155 28800 7200 1209600 7200
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0