mail15.alerts.actcorp.in has no NS records.
NS records for this zone are defined at actcorp.in.
NS records for this zone are defined at actcorp.in.
Question and response
Question
dig mail15.alerts.actcorp.in. NS
Answer
The response has no answer records.
Authority
actcorp.in. 1800 SOA ns1.actcorp.co.in. root\@actcorp.in. 78205 10800 3600 604800 38400
Additional
. 0 OPT ; payload 4096, xrcode 0, version 0, flags 0