Explanation/Reference: https://docs.splunk.com/Documentation/ES/6.4.1/Admin/Manageinternallookups

Explanation/Reference: https://dev.splunk.com/enterprise/docs/developapps/enterprisesecurity/datamodelsusedbyes/

Explanation
To configure an "Nslookup" adaptive response action, so that it appears as a selectable option in the notable event's action menu when an analyst is working in the Incident Review dashboard, the administrator would take the following steps:
On the Splunk Enterprise Security menu bar, click Configure > Content > Content Management.
Filter the content by Type: Correlation Search and select the correlation search that you want to add the Nslookup action to.
Click Edit and go to the Notable tab.
Under Recommended Actions, click Add New Action and select Nslookup from the drop-down menu.
Enter the required fields for the Nslookup action, such as the host field, the DNS server, and the output index.
Click Save to save the changes to the correlation search.
The Nslookup action will now appear as an option in the notable event's action menu on the Incident Review dashboard. References = Set up Adaptive Response actions in Splunk Enterprise Security Included adaptive response actions with Splunk Enterprise Security