mx03.masterlogin.de has no NS records.
NS records for this zone are defined at masterlogin.de.
NS records for this zone are defined at masterlogin.de.
Question and response
Question
dig mx03.masterlogin.de. NS
Answer
The response has no answer records.
Authority
masterlogin.de. 3600 SOA ns1.routing.net. hostmaster.masterlogin.de. 2026021100 86400 7200 3600000 3600
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0