However, the sites continue to operate outside the UK, and surfers often find ways to circumvent the ISPs' restrictions, using proxy servers or other identity-disguising services.
The sites taken down by City of London Police do not offer pirated content themselves, but rather offer tools that allow users to connect to illegal services such as the Pirate Bay and similar torrent sites.
"Internet users have sought ways to continue to access the sites by getting round the blocking put in place by the ISPs," said Kieron Sharp, director general of Fact.
"This operation is a major step in tackling those providing such services."
Det Ch Insp Andy Fyfe, head of Pipcu, said the operation highlights how it is "working in partnership with the creative and advertising industries" on targeting "every aspect of how copyrighting material is illegally being made available to internet users".
He added: "We will come down hard on people believed to be committing or deliberately facilitating such offences."
The man was questioned at a local police station before being released on bail.