ns2.opst.de has no NS records.
NS records for this zone are defined at opst.de.
NS records for this zone are defined at opst.de.
Question and response
Question
dig ns2.opst.de. NS
Answer
The response has no answer records.
Authority
opst.de. 86400 SOA ns1.opst.de. support.variomedia.de. 2022101068 28800 7200 1209600 86400
Additional
. 0 OPT ; payload 4096, xrcode 0, version 0, flags 0