Cp3.americanet.com.br has no NS records.
NS records for this zone are defined at americanet.com.br.
NS records for this zone are defined at americanet.com.br.
Question and response
Question
dig Cp3.americanet.com.br. NS
Answer
The response has no answer records.
Authority
americanet.com.br. 86400 SOA cp1.americanet.com.br. postmaster.americanet.com.br. 2026022804 3600 1800 1209600 86400
Additional
. 0 OPT ; payload 4096, xrcode 0, version 0, flags 0