ns2.cray.com.br has no NS records.
NS records for this zone are defined at cray.com.br.
NS records for this zone are defined at cray.com.br.
Question and response
Question
dig ns2.cray.com.br. NS
Answer
The response has no answer records.
Authority
cray.com.br. 86400 SOA ns3.cray.com.br. rodrigo.mundoopen.com.br. 2026011400 43200 7200 2419200 86400
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0