testedomainsf.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 e78038.dsca.akamaiedge.net. NS
Answer
The response has no answer records.
Authority
dsca.akamaiedge.net. 1000 SOA n0dsca.akamaiedge.net. hostmaster.akamai.com. 1773221776 1000 1000 1000 1800
Additional
. 0 OPT ; payload 4096, xrcode 0, version 0, flags 0