spf.bert.group has no NS records.
NS records for this zone are defined at bert.group.
NS records for this zone are defined at bert.group.
Question and response
Question
dig spf.bert.group. NS
Answer
The response has no answer records.
Authority
bert.group. 172800 SOA ns1.arvato-systems.de. hostmaster.bnic.bertelsmann.de. 2026011300 86400 7200 3600000 172800
Additional
. 0 OPT ; payload 1680, xrcode 0, version 0, flags 0