db1o.hdcloud.com.br has no NS records.
NS records for this zone are defined at hdcloud.com.br.
NS records for this zone are defined at hdcloud.com.br.
Question and response
Question
dig db1o.hdcloud.com.br. NS
Answer
The response has no answer records.
Authority
hdcloud.com.br. 900 SOA ns-175.awsdns-21.com. awsdns-hostmaster.amazon.com. 1 7200 900 1209600 86400
Additional
. 0 OPT ; payload 4096, xrcode 0, version 0, flags 0