‘DNS propagation’ meaning the updating of information across the Internet. It takes two types: changes to your DNS Zone and changes to your WHOIS information.
A change to your DNS Zone information typically affects only a handful of servers, and completes much more quickly. However, the WHOIS is the master record which tells every DNS server in the world the server for your domain. A change to your WHOIS information (such as updating the ADMIN-C in your control panel) can take up to 72 hours to propagate fully.
Customers often call Hosting Master support centre to say that they cannot see their domain names after ordering them, or just after a transfer between registrars. After either of these two events your domain name or website may not be visible for up to 48 hours, mainly because millions of DNS servers need to be updated with the new information you updated.
You can monitor your self how your DNS update propagated across global main server by querying on below link.
Or contact support center for more information.