_spf.ati.tn has no NS records.
NS records for this zone are defined at ati.tn.
NS records for this zone are defined at ati.tn.
Question and response
Question
dig _spf.ati.tn. NS
Answer
The response has no answer records.
Authority
ati.tn. 10800 SOA ns4.ati.tn. hostmaster.ati.tn. 2026023511 21600 7200 1209600 10800
Additional
. 0 OPT ; payload 4096, xrcode 0, version 0, flags 0