CCTV is ubiquitous in the UK. A recent study estimates there are about 1.85m cameras across the UK - most in private premises. Most of those cameras will be connected to some kind of recording device, which these days means a Digital Video Recorder or DVR.

DVRs take video feeds from multiple cameras and store them onto a drive. As well as displaying images on a screen, most of them can be accessed over a network, allowing users to connect using either a web browser or a custom client.

Of course, business and home owners want to access their DVRs remotely to keep an eye on things. The DVRs get opened up to the Internet using port-forwarding, and because of this, we can find hundreds of thousands of them quickly and easily on Shodan.


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