zimbra.atento.com.br has no NS records.
NS records for this zone are defined at atento.com.br.
NS records for this zone are defined at atento.com.br.
Question and response
Question
dig zimbra.atento.com.br. NS
Answer
The response has no answer records.
Authority
atento.com.br. 1800 SOA bonnie.ns.cloudflare.com. dns.cloudflare.com. 2398108751 10000 2400 604800 1800
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0