ws2.supersaas.com has no NS records.
NS records for this zone are defined at supersaas.com.
NS records for this zone are defined at supersaas.com.
Question and response
Question
dig ws2.supersaas.com. NS
Answer
The response has no answer records.
Authority
supersaas.com. 900 SOA ns-1964.awsdns-53.co.uk. awsdns-hostmaster.amazon.com. 1 7200 900 1209600 86400
Additional
. 0 OPT ; payload 4096, xrcode 0, version 0, flags 0