You’ve registered your domain name, paid for
hosting with EMWD.com, and uploaded your website to the web
server. If this is all done, why can’t you see the results of your hard
work right away under your domain name? What is this DNS propagation people keep telling you
about?
In order to understand DNS propagation, you must first understand a
little about how DNS works. When you set up your website with EMWD.com, we create a Master DNS record in our Domain Name
Servers. Your domain registrar (the company you paid for the honor of
owning your domain name) points to our DNS server as being
the master authority of your domain.
When any outside source wants to know how to find your website, they
first go to the registration database to find out who the DNS authority
is for your website. Then they visit our DNS servers
to find out what the IP Address is for your domain name, and from there
your audience can now view your website.
The problem with this whole scheme is that in order to speed up the rate
at which their customers can view the internet, each Internet Server
Provider caches their DNS records. This means that they make their own
copy of the master records, and read from them locally instead of
looking them up on the Internet each time someone wants to view a
website. This actually speeds up web surfing quite a bit by: (1)
speeding up the return time it takes for a web browser to request a
domain lookup and get an answer, and (2) actually reducing the amount of
traffic on the web therefore giving it the ability to work faster.
The downside to this caching scenario and what makes it take so long for
your website to be visible to everyone, is that each company or ISP
that caches DNS records only updates them every few days. There is not
any kind of standard, and they can set this time anywhere from a few
hours to several days. The slow updating of the servers cache is called
propagation, since your websites DNS information is now being propagated
across all DNS servers on the web. When this is finally complete,
everyone can now visit your new website. Being that the cache time is
different for all servers, as mentioned above, it can take anywhere from
24 to 72 hours for DNS changes to be totally in effect for everyone.
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