Every device which is connected to the router, including a computer, smartphone, DVR, NVR, IP camera, no matter by ethernet cable or by wifi, will be distributed an IP by the router.
All these devices are listed on the router‘s page. Here is a method to find it.
1. Find your router‘s address. Usually, the router‘s address is as same as your computer‘s gateway.
2. Access the router by its IP address on your computer browser. The default user name and password of your router are on the label of the router.
Please notice router’s user name and password is not as same as the wifi’s user name and password.
You can also search your router‘s default user name and password on google or contact the support of the router.
3. Find the DHCP list. The picture below is my router‘s page. Every router’s page is different.
4. Finally, your computer can access DVR by its IP address: