ISP blocked due to abuse?

Well, it seems today that I'm now unable to post anything over at the 4chan imageboards, otherwise I get this message:
"Posting from your ISP has been blocked due to abuse. [More Info]"
I can still browse the site, all the images and threads load fine, I just can't post. What gives? I've never posted spam or porn.

Leaseweb (Netherlands)

Can't post anymore. ISP is blocked. I have a static IP and I believe everyone else in this block has a static IP too so it's easy to block abusers. Blocking a whole subnet makes no sense