mx05.cnsistemas.net has no NS records.
NS records for this zone are defined at cnsistemas.net.
NS records for this zone are defined at cnsistemas.net.
Question and response
Question
dig mx05.cnsistemas.net. NS
Answer
The response has no answer records.
Authority
cnsistemas.net. 86400 SOA ns1.cnsistemas.net. root.vps-4739503.cnsistemas.net. 2026031301 3600 1800 1209600 86400
Additional
. 0 OPT ; payload 4096, xrcode 0, version 0, flags 0