Go to the manufacturer’s website. Download the latest firmware. The viewerframe interface is often replaced with modern, secure HTML5 interfaces in new firmware.

inurl:viewerframe mode motion network camera

Shodan clearly marks unauthenticated cameras and is widely used for exposure mapping.

If you own an IP camera, ensure it is not discoverable via search engines or exposed to the public internet:

Cameras found under this URL structure often share several technical characteristics: