opus.isdsl.net has no NS records.
NS records for this zone are defined at isdsl.net.
NS records for this zone are defined at isdsl.net.
Question and response
Question
dig opus.isdsl.net. NS
Answer
The response has no answer records.
Authority
isdsl.net. 600 SOA ns1.is.co.za. support.is.co.za. 2022033001 28800 7200 604800 10800
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0