vps.l0op.de has no NS records.
NS records for this zone are defined at l0op.de.
NS records for this zone are defined at l0op.de.
Question and response
Question
dig vps.l0op.de. NS
Answer
The response has no answer records.
Authority
l0op.de. 3600 SOA ns1.your-server.de. postmaster.your-server.de. 2026021200 86400 10800 3600000 3600
Additional
. 0 OPT ; payload 4096, xrcode 0, version 0, flags 0