Why Use Different DNS Servers?
One reason you might want to change the DNS servers assigned by your ISP is if you suspect there's a problem with the ones you're using now. An easy way to test for a DNS server issue is by typing a website's IP address into the browser. If you can reach the website with the IP address, but not the name, then the DNS server is likely having issues.
Another reason to change DNS servers is if you're looking for a better performing service. Many people complain that their ISP-maintained DNS servers are sluggish and contribute to a slower overall browsing experience.
Yet another, increasingly common reason to use DNS servers from a third party is to prevent
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Log in or register now. and to circumvent the blocking of certain websites.
Know, however, that not all DNS servers avoid traffic logging. If that's what you're after, make sure you read all the details about the server to know if that's the one you want to use.
Finally, in case there was any confusion, free DNS servers do
not give you free internet access! You still need an ISP to connect to for access - DNS servers just translate IP addresses and domain names.
From: Lifewire