Sometimes you need to move to the new host for whatever reasons. And when you moving to the new host you are also need to repoint your domain nameserver to the new host name server. When repoint your nameserver it’s not instantly change to all dns server, this process called dns propagation. DNS propagation need maximum 48 hours for it to fully propagated.
While in propagation time, you may still access to your old server as well as your other visitors. So while in propagation time i suggest you not to update anything on your website. But you can still access your new server by hack your hosts file. Read more here: Migrating Your Website To New Server Without Down Time
But how do you know if your domain nameserver is fully propagated? I have 2 tools to check it:
whatsmydns.net is an online service that allows you to instantly perform a DNS lookup to check a hostnames current IP Address and other DNS information against a selection of random name servers around the world. This is especially useful to check the current state of DNS propagation after making changes to your domains zones.
- Host Tracker
Host Tracker is website monitoring from many nodes that spread all over the world. To see if your website is up and accessible. You can check your server ip and if it is not the same ip (using 1 server), then it’s not fully propagated. Beside check the ip, it also check your server speed from different location.