ns01.btsaas.net has no NS records.
NS records for this zone are defined at btsaas.net.
NS records for this zone are defined at btsaas.net.
Question and response
Question
dig ns01.btsaas.net. NS
Answer
The response has no answer records.
Authority
btsaas.net. 3600 SOA ns01.btsaas.net. hostmaster.nsone.net. 1618492601 43200 7200 1209600 3600
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0