spf2.danner.com has no NS records.
NS records for this zone are defined at danner.com.
NS records for this zone are defined at danner.com.
Question and response
Question
dig spf2.danner.com. NS
Answer
The response has no answer records.
Authority
danner.com. 1800 SOA cash.ns.cloudflare.com. dns.cloudflare.com. 2398608253 10000 2400 604800 1800
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0