mx01.laiso.eti.br has no NS records.
NS records for this zone are defined at laiso.eti.br.
NS records for this zone are defined at laiso.eti.br.
Question and response
Question
dig mx01.laiso.eti.br. NS
Answer
The response has no answer records.
Authority
laiso.eti.br. 900 SOA d.sec.dns.br. hostmaster.registro.br. 2026034000 345600 900 604800 900
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0