ns01.refeduc.com.br has no NS records.
NS records for this zone are defined at refeduc.com.br.
NS records for this zone are defined at refeduc.com.br.
Question and response
Question
dig ns01.refeduc.com.br. NS
Answer
The response has no answer records.
Authority
refeduc.com.br. 3600 SOA ns1-34.azure-dns.com. hostmaster.franciscanos.net. 2016111252 1200 600 1209600 3600
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0