How Domain Names Work by Tim Priebe
I often have to explain to clients why, when they first get a domain name and
website, it takes up to 48 hours for someone to be able to see their website.
This can happen if they switch web servers, as well. The key to understanding
this is understanding a little bit of how domain names work.
Keep in mind, this explanation will be just a bit simplified, to make it easier
to understand. I don't like filling my explanations to clients with technical
jargon, so I'm going to attempt to avoid that here.
The first thing to understand is this. Web hosting (or web space) is completely
different from your domain name. Where your website's files actually sit has
nothing to do with what your site is called. In fact, you can even purchase
your domain name from one company and your web hosting from another. Many
people do.
So how, when someone goes to your web address, does it know where your web
hosting is? Each web host actually has a numerical address. Let's say your web
site is at www.yourcompany.com, and your actual web hosting address is
216.60.153.87. How does my computer know that by typing in www.yourcompany.com,
it should actually go to 216.60.153.87?
It doesn't. Instead, it asks my Internet service provider (Cox, AOL, SBC,
etc.). Each Internet service provider has all that information stored. So my
computer sends my ISP the web address, www.yourcompany.com, and my ISP actually
looks that up at 216.60.153.87.
Hopefully that clears up a little bit the association between the domain name
(www.yourcompany.com) and what is referred to as the IP address (or name
server) of your web host (216.60.153.87). Now, let's move on to why it takes up
to 48 hours to update those records.
Let's say you buy a new domain name through Go Daddy. For every domain name
someone buys through them, Go Daddy has their domain name and actual numerical
address stored. That's thousands of domain names. But when you buy a new domain
from them, at the beginning, they're the only ones who have that information.
They then have to get that information out to the rest of the Internet.
So how does that happen? Let's use an analogy. How that spreads is similar to
how the flu spreads. If you were spreading the flu on purpose, that is. Let's
say you had the flu, and wanted to spread it to as many people as possible, but
could only infect one person at a time. The key, then, would be getting those
people to then also infect others.
That's how the spread of your domain name works. Go Daddy (or whoever),
regularly contacts other computers out on the Internet and passes on this
information. Then those computers do the same. However, one computer might send
out this information every hour, another every six hours, another every fifteen
minutes. The schedule of each computer is not the same.
So 48 hours is the maximum amount of time, the experts agree, that it will take
the information about your domain name to spread to all those computers (called
domain name servers, or name servers for short). The technical term for this,
if you're interested in knowing, is propagation. 48 hours is the maximum amount
of time it takes your domain record to propagate to all the domain name servers
on the Internet.
As complicated as this sounds, I've actually simplified it quite a bit. But the
essential concept is there.
About the Author
Tim is the owner and senior web designer at T&S
Web Design. His company has developed and maintained website for dozens
of small businesses and organizations. Tim also maintains a blog with free
website advice for small business owners, GetASiteOnline.com.
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