mail.interpow.net has no NS records.
NS records for this zone are defined at interpow.net.
NS records for this zone are defined at interpow.net.
Question and response
Question
dig mail.interpow.net. NS
Answer
The response has no answer records.
Authority
interpow.net. 3600 SOA pns1.cloudns.net. support.cloudns.net. 2020053013 7200 1800 1209600 3600
Additional
. 0 OPT ; payload 4096, xrcode 0, version 0, flags 0