Can't access my site on my network connection

This is a client site I haven’t touched in at least 2 months, if not longer. Not a lot of updates for it lately. Site address is regattapoint.org

I was recently asked to check in on a small issue related to Woocommerce. However as of this morning, I can’t see the site or access the dashboard at all. I just get the standard “page unavailable” message from both Firefox and Chrome. However, when I try to look at the site with my phone on a 3G connection, I can see the site fine. I updated the site to WP 4.0.1 and managed to update plugins but I still can’ see the site on my PC or other devices connected to wifi at home.

A tracert for regattapoint.org doesn’t resolve – tracerouting the direct IP address shows a drop right from my router. I’ve flushed DNS cache, reset the router, released/renewed DHCP, still no result. I’ve cleared both Chrome and Firefox cache and cookies, restarted my PC, still nothing.

I previously had a plugin called Wordfence on my site. I didn’t see my IP address listed on any blacklists for it, but just for testing purposes, I deactivated and then deleted the plugin. Nothing. I removed WP Supercache as well, still nothing.

Now when I go into the WP Dashboard on my phone, the Admin page shows up as blank. The front end of the site still looks fine.

I’m running out of options – what could be causing this? Godaddy was not much help because this didn’t seem to be a problem on their end and more of a problem with my ISP. I haven’t touched this site at all in recent months, why would my ISP suddenly deny me access to the site? It makes no sense at all.

Any suggestions and tips would be greatly appreciated.