spf.protagonist.nl has no NS records.
NS records for this zone are defined at protagonist.nl.
NS records for this zone are defined at protagonist.nl.
Question and response
Question
dig spf.protagonist.nl. NS
Answer
The response has no answer records.
Authority
protagonist.nl. 1800 SOA ken.ns.cloudflare.com. dns.cloudflare.com. 2397669013 10000 2400 604800 1800
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0