Okay, so if I go to downforeveryoneorjustme.com and find that cathinfo is up for everyone else, then what?
I tried two different browsers and two different servers. What else can I try?
I was able to get on any other site I tried, but CathInfo alone was simply not happening.
Two different servers? You mean proxy servers?
Considering that you haven't been banned from CI, much less ip-banned, you could always just use your regular IP address to visit CathInfo (in other words, just browse CI without a proxy -- take no extra steps in this regard).
I'm not blocking any ranges of IPs in the US or any other "decent" country -- at least not that I'm aware of.
Another thing -- when it happens, perhaps you could go to www.whatismyip.com
and tell me via e-mail what IP address is being blocked. Then I can fix it.