When Will Nameserver Changes Take Effect?

Because servers across the Internet cache DNS information, your domain name will not appear to point to your site immediately after you update your nameservers. Even after the changes are submitted to the central Internet domain name servers, it generally takes anywhere from 24 to 72 hours for all service providers to clear their DNS caches and get the updated records. The delayed processing and distribution of updates made to domain name records is known as DNS propagation.

Also note that propagation of the changes to your domain name won't happen for all visitors at once. Some visitors' ISPs may pick up changes more quickly than others, meaning that during the 24 to 72 hour propagation period, some people will be directed to your site's old IP address while others will be taken to your new one.

If you are still not seeing your site after the estimated propagation period your ISP could be caching your site, you can test to see if this is the case by viewing your site via proxy by clicking here

You can also flush your dns by performing the following:

Go to start, run and type:

ipconfig /flushdns