mx.rackspeed.de has no NS records.
NS records for this zone are defined at rackspeed.de.
NS records for this zone are defined at rackspeed.de.
Question and response
Question
dig mx.rackspeed.de. NS
Answer
The response has no answer records.
Authority
rackspeed.de. 600 SOA ns.rackspeed-dns.de. hostmaster.rackspeed.de. 2026022305 3600 600 1209600 600
Additional
. 0 OPT ; payload 4096, xrcode 0, version 0, flags 0