Vodafone Spain is deploying a new web blocking system dubbed Castor. This is the first time that a Spanish ISP has taken the web blocking beyond the DNS or IP level. They're performing large-scale Man-in-the-Middle attacks, intercepting HTTP requests to some website's IPs and serving an HTML redirect to their blocking system instead.
The blocking system has received a lot of public exposure when The Pirate Bay was included in the blocking list. The block affected only a few broadband customers since December 2014, but on January 26th the block was deployed to the whole Vodafone network, affecting most (if not all) customers.