ns.namespace4you.de has no NS records.
NS records for this zone are defined at namespace4you.de.
NS records for this zone are defined at namespace4you.de.
Question and response
Question
dig ns.namespace4you.de. NS
Answer
The response has no answer records.
Authority
namespace4you.de. 2560 SOA ns.namespace4you.de. hostmaster.ns.namespace4you.de. 1772712301 86400 2048 1048576 2560
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0