a.dns.mantenedora.io has no NS records.
NS records for this zone are defined at mantenedora.io.
NS records for this zone are defined at mantenedora.io.
Question and response
Question
dig a.dns.mantenedora.io. NS
Answer
The response has no answer records.
Authority
mantenedora.io. 300 SOA ns-cloud-a1.googledomains.com. cloud-dns-hostmaster.google.com. 12 21600 3600 259200 300
Additional
. 0 OPT ; payload 512, xrcode 0, version 0, flags 0