bouncer.streamsend.com has no NS records.
NS records for this zone are defined at streamsend.com.
NS records for this zone are defined at streamsend.com.
Question and response
Question
dig bouncer.streamsend.com. NS
Answer
The response has no answer records.
Authority
streamsend.com. 900 SOA ns-389.awsdns-48.com. awsdns-hostmaster.amazon.com. 1 7200 900 1209600 86400
Additional
. 0 OPT ; payload 4096, xrcode 0, version 0, flags 0