"Securing court orders requiring ISPs [internet service providers] to block access to illegal websites is an accepted and legitimate measure to tackle online copyright infringement," said Chris Marcich, president of the MPA's European division.
"It carefully targets sites whose sole purpose is to make money off the back of other people's content while paying nothing back into the legitimate economy."
Twenty-one of the sites were a result of a court order prompted by the BPI, a music industry group.
Many of the services hosted links to pirated software, TV shows and ebooks in addition to films and songs.
The ISPs affected are Sky, BT, Everything Everywhere, TalkTalk, O2 and Virgin.
"BT will only block access to websites engaged in online copyright infringement when ordered by a court to do so," said the UK's biggest broadband provider, reflecting a stance shared by the other firms.