b.xnameserver.de has no NS records.
NS records for this zone are defined at xnameserver.de.
NS records for this zone are defined at xnameserver.de.
Question and response
Question
dig b.xnameserver.de. NS
Answer
The response has no answer records.
Authority
xnameserver.de. 3600 SOA a.xnameserver.de. hostmaster.xnameserver.de. 2022062902 10800 3600 604800 3600
Additional
. 0 OPT ; payload 1400, xrcode 0, version 0, flags 0