spf.mailinblack.com has no NS records.
NS records for this zone are defined at mailinblack.com.
NS records for this zone are defined at mailinblack.com.
Question and response
Question
dig spf.mailinblack.com. NS
Answer
The response has no answer records.
Authority
mailinblack.com. 10800 SOA ns1.gandi.net. hostmaster.gandi.net. 1772540954 10800 3600 604800 10800
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0