Question: how to tell if you have been blocked from a website?
Answer: Blocked.org.uk. This website lets you check whether a site has been blocked by these filters. ... 
UpDown.co. ... 
CheckSite.us. ... 
Blockedinchina.net. ... 
Downornot.net. ... 
Host-tracker.com. ... 
Isup.me. ... 
Upordown.net.