lum.spnr.de has no NS records.
NS records for this zone are defined at spnr.de.
NS records for this zone are defined at spnr.de.
Question and response
Question
dig lum.spnr.de. NS
Answer
The response has no answer records.
Authority
spnr.de. 300 SOA nox.spnr.de. hostmaster.spnr.de. 13215 14400 3600 1209600 300
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0