spf.mcdns.com.br has no NS records.
NS records for this zone are defined at mcdns.com.br.
NS records for this zone are defined at mcdns.com.br.
Question and response
Question
dig spf.mcdns.com.br. NS
Answer
The response has no answer records.
Authority
mcdns.com.br. 3600 SOA pns31.cloudns.net. support.cloudns.net. 2025080101 7200 1800 1209600 3600
Additional
. 0 OPT ; payload 4096, xrcode 0, version 0, flags 0