Why does it take up to three days for my site to be visible?

Topic: Advanced Web Hosting Help |

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Once the account is set up on a server the “nameservers” for the domain hosted on the server must be changed. Nameservers are the internet’s way to direct someone to your site. When someone types in the address: www.yourdomain.com that name is translated (or resolved) into numbers (called an IP address) and then the computer is directed to the correct site using those numbers. The translation of a domain name to an IP address is done through nameservers. Nameservers are handled by a domain registrar—the place where the domain name was registered.
Once the nameservers have been updated at the domain registrar it takes up to 72 hours for this information to filter through the internet. What happens is that your domain registrar submits this information to the master record database and it is available there very soon. However, each ISP (the way you access the internet) does not use the master record every time they need to find a domain name.

“even though you made the nameserver changes it *depends* on when your ISP updates the info in their database”

What the ISPs do is copy the master record and then have their own database of nameserver information. When someone on their ISP looks for a domain name they are given the information in their database not necessarily the up to date master record. The problem comes due to the fact that each ISP updates their database with the new information whenever they want to. Some do it every night, some every other day and some up to 3 days.
So even though you made the nameserver changes it *depends* on when your ISP updates the info in their database, which can take up to three days even though your account is activated right away. This does not mean you cannot access your account and transfer files–you can do that right away as well as set up all of your mail accounts and more, but until everyone updates to the new records some people might not find your site. The process of this filtering of the master record through the internet is called DNS propagation.

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