CIDR is the short for Classless Inter-Domain Routing, an IP addressing scheme that replaces the older system based on classes A, B, and C.  single IP address can be used to designate many unique IP addresses in CIDR format.

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How to stop over 400 sites logging everything you type: A complete list of every site using session replay scripts | Alphr

You’ve read the news about session replay scripts and how they enable over 400 websites to track your every keystroke and mouse click and you’re, understandably, concerned. If you haven’t been following the news, researchers at Princeton University’s Centre for Information Technology Policy (CITP), discovered that 400 of the most popular websites in the world, including The Telegraph and BBC Good Food are running code capable of tracking everything you type into a website.

Source: How to stop over 400 sites logging everything you type: A complete list of every site using session replay scripts | Alphr