spf.uberspace.de has no NS records.
NS records for this zone are defined at uberspace.de.
NS records for this zone are defined at uberspace.de.
Question and response
Question
dig spf.uberspace.de. NS
Answer
The response has no answer records.
Authority
uberspace.de. 600 SOA ns1.jonaspasche.com. hostmaster.uberspace.de. 1772180041 1800 300 604800 600
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0