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Michael Horowitz 
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NOTE: I gave a presentation on Defensive Computing at the HOPE conference (July 2022) that was based on my Defensive Computing Checklist website.
 

There are many choices for DNS providers and the default, using DNS servers from an ISP, is the worst option. Some options are below, the list is far from complete. DNS can be a great way to get ad blocking, tracker blocking and/or malware blocking without having to install software.

Old insecure DNS is specified with IP addresses (normally two of them). New Secure DNS is specified with a server name. Typically a company offers one server for DoH and another for DoT. That said, the two secure DNS flavors use different TCP ports, so they could both be available on a single server.

To test which DNS system/servers your computer is using, see the many available tester pages on the Test Your DNS page.

AD BLOCKING TESTER

If your DNS provider offers ad/tracking blocking, then you can see how well it is working at this tester page d3ward.github.io/toolz/adblock.html by Eduard Ursu. Note that it is possible your web browser is also doing some ad or tracker blocking of its own. For example, ad blocking is built into the Brave browser and its available from many browser plug-ins.



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