mail2.questback.net has no NS records.
NS records for this zone are defined at questback.net.
NS records for this zone are defined at questback.net.
Question and response
Question
dig mail2.questback.net. NS
Answer
The response has no answer records.
Authority
questback.net. 3600 SOA ns1.dnshost.net. zonemaster.dnshost.net. 1705568482 43200 3600 604800 3600
Additional
. 0 OPT ; payload 1400, xrcode 0, version 0, flags 0