How to discover selective range of devices in latest version of Network Configuration Manager?
Click on Setting > Discovery > Network Devices to go to the Device Discovery page.
Under Discovery, choose IP Range (By default it is selected) to specify the range.
Start IP: Specify the IP address of the device in the range from where OpManager should start discovery.
End IP: Specify the IP address till which OpManager should discover.
Select appropriate credentials from the list of available SNMP credentials, if the credentials are not pre-configured, you can always use the Add Credential button to add new credentials.