spf.masterbase.com has no NS records.
NS records for this zone are defined at masterbase.com.
NS records for this zone are defined at masterbase.com.
Question and response
Question
dig spf.masterbase.com. NS
Answer
The response has no answer records.
Authority
masterbase.com. 1800 SOA lovisa.ns.cloudflare.com. dns.cloudflare.com. 2397047605 10000 2400 604800 1800
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0