Yea, it depends on your school's filter system...some have learned to block the IP's as well, other's just don't. And others have annoying system administrators who block the sites used to help their problems (this one). Last year, the network admin would ask me for help with computer stuff (because they don't know anything), so I told him about this site, and he used it. Now, they blocked it. Weird. Anyway, some sites can be accessed using a security protocol. (
https:// instead of
http://) Example,
http://timlink.netfirms.com is blocked my school's filter (Bess), because it's on a free hosting service. However,
https://timlink.netfirms.com works perfectly fine. (Well, it did, until they blocked it because they realized I made it, and they don't like me. But it works for other sites as well.)