If you use a router, then connect to the administration interface and locate the DHCP Clients category. Click it, and you should see all the IPs assigned by the router. You can then test them to see which is the correct one.
Secondly, you can use Command Prompt. Press Windows + R and type CMD then arp -a and all the dynamic IPs will be listed. One of them is the IP of the camera.
You should see something like this.