joiceongoingrealtimecloudfront-dev.oi.com.br has no NS records.
NS records for this zone are defined at oi.com.br.
NS records for this zone are defined at oi.com.br.
Question and response
Question
dig dbr1a9q7c2vsy.cloudfront.net. NS
Answer
The response has no answer records.
Authority
cloudfront.net. 60 SOA ns-418.awsdns-52.com. hostmaster.cloudfront.net. 1377556270 16384 2048 1048576 60
Additional
. 0 OPT ; payload 4096, xrcode 0, version 0, flags 0