DNS Propagation: Why DNS Changes Take Time and How to Test Globally
Understand why updating your nameservers or hosting server takes hours to reflect globally and how to accelerate the propagation lifecycle.
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What is DNS Propagation?
DNS Propagation is the time frame required for global DNS resolvers and ISP caches to refresh and reflect new DNS record updates across the world.
How Long Does DNS Propagation Take?
DNS updates generally propagate within 1 to 48 hours, governed by:
- Previous TTL: If your prior TTL was 86400 (24 hours), caches will retain outdated records until that TTL expires.
- ISP Caching Policies: Some ISPs override standard TTL values to conserve bandwidth.
- Record Type: NS changes usually take longer than standard A or CNAME updates.
Pro Tip: Lower your TTL to 300 seconds (5 minutes) at least 24 hours prior to a website migration to ensure instant cutover.
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β Frequently Asked Questions (FAQ)
How can I flush my local computer's DNS cache? βΎ
On Windows, run <code>ipconfig /flushdns</code> in Command Prompt. On macOS, run <code>sudo dscacheutil -flushcache; sudo killall -HUP mDNSResponder</code>.