ti-oinovafibra.cs195.oi.com.br has no NS records.
NS records for this zone are defined at oi.com.br.
NS records for this zone are defined at oi.com.br.
Question and response
Question
dig st1.edge.sfdc-yzvdd4.edge2.salesforce.com. NS
Answer
The response has no answer records.
Authority
edge2.salesforce.com. 3600 SOA dns1.p02.nsone.net. hostmaster.nsone.net. 1669710010 43200 7200 1209600 3600
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0