DNS propagation is the time it takes for DNS changes (like updating the IP address for your domain) to spread across the internet. When you change DNS records at your domain registrar or DNS provider, the update isn’t instantly visible everywhere—different networks and DNS resolvers refresh their cached data on different schedules.
What is DNS propagation?
DNS (Domain Name System) is like the internet’s phone book: it translates a domain name (like example.com) into an IP address (like 203.0.113.10). When you update a DNS record, DNS servers and caching resolvers around the world need time to notice that change and replace the old cached value with the new one.
Why does it take time?
- Caching: Many ISPs, browsers, and DNS resolvers cache DNS responses to speed up browsing.
- TTL (Time To Live): DNS records have a TTL value that tells caches how long they can keep the record before checking again.
- Different refresh schedules: Not every resolver checks for updates at the exact moment a TTL expires.
3 tips while you’re waiting for propagation
- Check the TTL and wait at least that long: If your record TTL is 1 hour, it can realistically take at least 1 hour (sometimes longer) for many networks to pick up the new value.
- Test from multiple networks/locations: Try your domain from mobile data vs. Wi‑Fi, or use online DNS checkers to see what different resolvers are returning.
- Clear local DNS cache (only if needed): Your device may be holding on to an old response. Flushing your DNS cache (and sometimes restarting your router) can help you see the updated record sooner.
Good to know: In most cases, DNS changes are visible within a few hours, but some updates can take up to 24–48 hours depending on TTL settings and caching behavior.