Understand DNS propagation, why DNS changes do not always appear instantly and what to check while waiting for updates.
DNS propagation is the period after a DNS change when different networks may still show different results. One person may see your new website while someone else still sees the old server.
This can be confusing during website launches and migrations, but it is a normal part of how DNS caching works.
DNS propagation can take from a few minutes to 24–48 hours depending on caching, TTL values, resolvers and the type of DNS change. Many changes appear sooner, but it is sensible to allow extra time.
DNS information is cached by browsers, devices, routers, internet providers and public DNS resolvers. Caching helps the internet work faster because every request does not need to start from scratch.
The downside is that cached records can continue to be used until they expire. This is why DNS changes may appear at different times in different locations.
Changing an A record or MX record can often appear relatively quickly, especially if the TTL is low. Nameserver changes may take longer because the delegation information itself needs to update.
During a nameserver change, it is common to see mixed results for a while. This is why you should keep old services active during the transition.
Before a planned migration, lower TTL values ahead of time if you have control over them. This can help future changes update more quickly. After the move is complete, TTL values can be increased again if desired.
Also prepare the new hosting before changing DNS. That way, when visitors start reaching the new server, the website is already ready.
Use DNS lookup tools from different locations to see which IP address or mail server is being returned. Also test from your own browser, mobile data and another network if possible.
Remember that DNS can look correct while the website still has a separate configuration issue. Always test the website itself after checking DNS.
If you are not sure which option is right for your website, start with our Start Here page or compare our UK Web Hosting services.
You can also explore VPS Hosting UK and VDS Hosting UK if your website needs more control, dedicated resources or room to grow. During a migration, keep both old and new services available until DNS has settled.
DNS propagation is mostly about caching and timing. Plan for it, test carefully and keep old services active for a short overlap period. That approach prevents most launch and migration headaches.