Your home computer creates a cache for all DNS settings. It does this to save time each time you visit a website. The issue is if you change your IP from moving hosts or to a dedicated IP for example, than your computer will get stuck on the old IP. The best way to speed up the process is to use these options.
For Mac:
sudo discoveryutil mdnsflushcache
sudo killall -HUP mDNSResponder
sudo dscacheutil -flushcache
For Windows 7:
- Click the start button and navigate to the command prompt (Start > All Programs > Accessories > Command Prompt)
- Now just type in the command
ipconfig /flushdns
For Windows 8:
- Type
cmdand the Windows search bar will appear on the right hand side. - Now just type in the command
ipconfig /flushdns
Keep in mind this does not always work. For example some ISP’s take days from their system to see a new IP and you just have to wait. I just had an issue with Charter taking 24 hours to see a DNS change.
Other tricks:
Try to check a website with and without the www. in front.
Try another browser
Reboot your computer
Turn off your computer, unplug it a couple minutes, then turn it back on.
In most cases the update is working everywhere within 30 minutes but there is those strange cases where it can take 48 hours.