mx2.infoserve.de has no NS records.
NS records for this zone are defined at infoserve.de.
NS records for this zone are defined at infoserve.de.
Question and response
Question
dig mx2.infoserve.de. NS
Answer
The response has no answer records.
Authority
infoserve.de. 3600 SOA dns1.infoserve.de. hostmaster.infoserve.de. 2026022301 28800 7200 1209600 3600
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0