ns2.flex1.net has no NS records.
NS records for this zone are defined at flex1.net.
NS records for this zone are defined at flex1.net.
Question and response
Question
dig ns2.flex1.net. NS
Answer
The response has no answer records.
Authority
flex1.net. 900 SOA ns1.flex1.net. noc.flex1.net. 110 900 300 604800 900
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0