201.22.100.110.dynamic.dialup.gvt.net.br has no NS records.
NS records for this zone are defined at dynamic.dialup.gvt.net.br.
NS records for this zone are defined at dynamic.dialup.gvt.net.br.
Question and response
Question
dig 201.22.100.110.dynamic.dialup.gvt.net.br. NS
Answer
The response has no answer records.
Authority
dynamic.dialup.gvt.net.br. 86400 SOA dns1.gvt.net.br. operacao.gvt.net.br. 9 28800 14400 604800 86400
Additional
. 0 OPT ; payload 4096, xrcode 0, version 0, flags 0