d.spf.cipnet.com.br has no NS records.
NS records for this zone are defined at cipnet.com.br.
NS records for this zone are defined at cipnet.com.br.
Question and response
Question
dig d.spf.cipnet.com.br. NS
Answer
The response has no answer records.
Authority
cipnet.com.br. 86400 SOA a.ns.cipnet.com.br. postmaster.cipnet.com.br. 2026020900 14400 7200 1209600 86400
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0