ipbx01.frionline.com.br has no NS records.
NS records for this zone are defined at frionline.com.br.
NS records for this zone are defined at frionline.com.br.
Question and response
Question
dig ipbx01.frionline.com.br. NS
Answer
The response has no answer records.
Authority
frionline.com.br. 3600 SOA master.frionline.com.br. adtech.frionline.com.br. 2026030800 3600 600 1209600 3600
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0