When a network camera is installed and connected to the internet, it often defaults to an insecure configuration. If the owner does not change these settings, the camera's web interface remains publicly accessible. Search engines like Google constantly "crawl" the web, indexing publicly accessible pages—including these cameras. A user can simply enter the query into any standard search engine and instantly receive a list of potential links to unprotected cameras worldwide, sometimes numbering in the thousands.
http://[IP_ADDRESS]/viewerframe?mode=motion inurl viewerframe mode motion network camera