Understanding DNS Propagation
DNS propagation is the time it takes for DNS changes to spread across all DNS servers worldwide. When you change your domain’s DNS records or nameservers, not everyone will see the changes at the same time.
How Long Does Propagation Take?
- A and CNAME records: Usually 1-4 hours, but can take up to 24 hours
- Nameserver changes: Up to 48 hours to propagate globally
- MX records (email): 1-24 hours
Why Do Different Users See Different Results?
Each internet provider caches DNS records for a period defined by the TTL (Time To Live) of the record. Until the cache expires, users see the old values. This is why some people may see your new website while others still see the old one during propagation.
How to Check Propagation
Use these free tools to check how your DNS changes are spreading:
- dnschecker.org – Check your domain from multiple locations
- whatsmydns.net – Visual global propagation checker
Reducing Propagation Time
Lower your DNS TTL value before making changes. Set it to 300 (5 minutes) a few hours before the change – this reduces the time DNS servers cache the old value.
Can I Speed Up Propagation?
Not significantly – propagation time is controlled by the worldwide DNS infrastructure. However, you can flush your local DNS cache to see the latest values on your own device: press Windows+R ? cmd ? ipconfig /flushdns.
