Just because you can not access your site does not mean it is down. There are a number of other possible reasons, you may be blocked by the firewall, there may be a network issue, etc.
Enter you site below to see if it is accessible from our network. If it does not come up, then your site is definitely down. If it does comes up, then that means there is no problem with your site, you should check with your ISP regarding you network connection, and check with your web host to see if your ip address is blocked. You can also try clearing your browser's cache, restarting your browser, restarting your internet connection, and rebooting your computer.
Your ISP IP Address is 18.104.22.168