l2c.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 a35e9aa123e61c157.awsglobalaccelerator.com. NS
Answer
The response has no answer records.
Authority
awsglobalaccelerator.com. 900 SOA ns-609.awsdns-12.net. awsdns-hostmaster.amazon.com. 1 7200 900 1209600 86400
Additional
. 0 OPT ; payload 4096, xrcode 0, version 0, flags 0