ns8.grupow.com.br has no NS records.
NS records for this zone are defined at grupow.com.br.
NS records for this zone are defined at grupow.com.br.
Question and response
Question
dig ns8.grupow.com.br. NS
Answer
The response has no answer records.
Authority
grupow.com.br. 3600 SOA ns10.grupow.com.br. atendimento.grupow.com.br. 1764010532 3600 3600 3600 3600
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0