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How to flush DNS on Windows
Flushing DNS clears cached name-to-address lookups. It can help with stale resolution problems, but it does not increase your broadband speed.
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WINDOWS DNS FIX
Use DNS fixes for name-resolution problems, not as a universal latency tweak.
If websites fail to resolve or a domain recently changed address, clearing the cache can help. If RaceMyNet shows high ping or packet loss, DNS is unlikely to be the direct cause once the connection has already been established.
Open Terminal or Command Prompt
Run Windows Terminal or Command Prompt. Administrator rights are normally not required just to flush the DNS resolver cache.
Run ipconfig /flushdns
Type ipconfig /flushdns and press Enter. Windows should confirm that the DNS Resolver Cache was successfully flushed.
Restart the affected app
Browsers and launchers can keep their own cached connections, so close and reopen the affected application after flushing.
Know what DNS changes
DNS helps find the IP address for a hostname. It is not the same thing as bandwidth, jitter or packet loss.
Test another resolver only when relevant
Changing DNS may improve reliability if your current resolver is slow or failing, but it usually does not meaningfully change game-server latency after resolution.
Measure before and after
Use the same test and conditions before and after a DNS change so you do not mistake normal network variation for an improvement.