redir.ig.com.br has no NS records.
NS records for this zone are defined at ig.com.br.
NS records for this zone are defined at ig.com.br.
Question and response
Question
dig redir.ig.com.br. NS
Answer
The response has no answer records.
Authority
ig.com.br. 900 SOA ns-1766.awsdns-28.co.uk. awsdns-hostmaster.amazon.com. 1 7200 900 1209600 86400
Additional
. 0 OPT ; payload 4096, xrcode 0, version 0, flags 0