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DNS information is cached at multiple points between your browser and the authoritative nameserver, each holding onto answers for a while to speed things up.
Where Caching Happens
Your browser, your operating system, your router, and your ISP's resolver can all hold a cached copy of a DNS answer, each with its own expiration timing.
When Clearing Helps
If you've recently changed a DNS record and still see the old result, clearing your local DNS cache (or trying a different network) sometimes shows the update sooner, though upstream caches are outside your control.
