zgateway.zuora.com has no NS records.
NS records for this zone are defined at zuora.com.
NS records for this zone are defined at zuora.com.
Question and response
Question
dig zgateway.zuora.com. NS
Answer
The response has no answer records.
Authority
zuora.com. 900 SOA ns-1376.awsdns-44.org. awsdns-hostmaster.amazon.com. 1 7200 900 1209600 900
Additional
. 0 OPT ; payload 4096, xrcode 0, version 0, flags 0