The DCS-930L is set to DHCP by default. Presuming these are brand new cameras that were never manually configured, the network settings will be set to DHCP. Connect the DCS-930L to your router via Ethernet and the router will pick up the device and list it in the connected devices table.
Referencing your router model from your other thread and reading through the user manual, here's how you can find the IP address of all connected devices:
DMZ > DHCP Client Table
The DHCP Client Table lists computers and other devices that have been assigned IP addresses by the
Router. The list can be sorted by Client Name, Interface, IP Address, MAC Address, and Expired Time (how much time is left for the current IP address).