mx2.checkdomain.de has no NS records.
NS records for this zone are defined at checkdomain.de.
NS records for this zone are defined at checkdomain.de.
Question and response
Question
dig mx2.checkdomain.de. NS
Answer
The response has no answer records.
Authority
checkdomain.de. 180 SOA ns.checkdomain.de. hostmaster.checkdomain.de. 2026030401 40000 7200 604800 180
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0