_spf.unitens.com has no NS records.
NS records for this zone are defined at unitens.com.
NS records for this zone are defined at unitens.com.
Question and response
Question
dig _spf.unitens.com. NS
Answer
The response has no answer records.
Authority
unitens.com. 600 SOA ns27.domaincontrol.com. dns.jomax.net. 2026020402 28800 7200 604800 600
Additional
. 0 OPT ; payload 1280, xrcode 0, version 0, flags 0