_spf.isite.de has no NS records.
NS records for this zone are defined at isite.de.
NS records for this zone are defined at isite.de.
Question and response
Question
dig _spf.isite.de. NS
Answer
The response has no answer records.
Authority
isite.de. 600 SOA dns.iwelt-ag.net. domainmaster.iwelt-ag.net. 2026012103 43200 3600 2419200 600
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0