I tried Civfanatics.net, it works for me at home, but clicking the link for the .com on that page does not work.
I pointed my browser to the IP address mentioned earlier and that also did not connect at my house, so it's probably not the DNS failing to resolve the URL, it's failing to communicate with the host for this site but not the other sites hosted by Telefragged.
I assume someone has access to logs of what IPs visit the site here, are you seeing access from Comcast and Charter customers? If so, it might be limited to specific DSLAMs, if not then there might be an issue for a large swath of US Internet users unable to come to the site.