mail.ionic.de has no NS records.
NS records for this zone are defined at ionic.de.
NS records for this zone are defined at ionic.de.
Question and response
Question
dig mail.ionic.de. NS
Answer
The response has no answer records.
Authority
ionic.de. 3600 SOA ns1.ionic.de. ionic.ionic.de. 2025122900 3600 1800 1500000 3600
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0