Why Does DNS Propagation Take Too Long?
The DNS propagation takes too long because some ISP servers and computers remember the the (old caches) setting for a long period of time. How? your computer, as well as the servers of your Internet Service Provider only update the records for the long interval of time. They assume that the records are the same as the last time it checked.
Before we learn about DNS propagation, let first learn a little bit about how DNS works. When you setup a website with a web hosting company, they always create a Master DNS record in their Domain Name Servers. When the change of the nameservers take place, the domain registrar (the company you paid for the honor of owning your domain name) will points the domain to webhosting provider DNS server because they host the master authority of domain.
If the website is queried from outside, the query command first go to the registration database to find out the DNS authority of the website. Then they visit webhosting DNS servers to find out what is the IP Address for the domain name in question, and from there the public audience can now access the website.
In order to speed up the rate at which their customers can view the internet, each Internet Server Provider caches the DNS records to their servers. They make their own copy of the master records and read them locally instead of reading them from the remote server. By this approach it speeds up website accessibility by (1) speeding up the duration browser uses to call the domain name (2) Reduce the amount of traffics on the web and therefore making the website load more faster
The negative part of the caching process is that different ISP update the caches differently; some instantly to 24 hrs, 36hrs and even others go to 72hrs. The rate of updating the cache between current to 72hrs is what we call DNS propagation. When the process is complete everyone will now see your website. Because the caching updating differ between ISP servers, the propagation duration is therefore said to vary between 24hrs to 72hrs for DNS and IP addresses to completely propagate to all ISP and hence become usable.
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How to Clear Caches
C:Documents and SettingsUser>ipconfig /flushdns
Windows IP Configuration
Successfully flushed the DNS Resolver Cache.
C:Documents and SettingsUser>nslookup cssites.com
C:Documents and SettingsUser>nslookup 126.96.36.199
Recommended Website to Check your DNS
(Generate full DNS report; DNS status, warning and errors with detailed information)
What’s my DNS? (Will show you a list of common name servers around the world, and tell you whether or not certain records related to your website have propagated to them)
intoDNS (will provide a complete list of your DNS records if available. If records are not yet available DNS propagation has not yet been completed fully)
Pingdom (Check DNS errors and warnings with additional information)
propagatedyet.com (Check domain DNS propagation against its IP Address)
Checkdnspropagation.com (Check domain propagation and if all parameters agree to each other)