Fifteen piracy websites will be blocked in Australia after the Federal Court gave the green light to Foxtel's latest bid to stop its shows being downloaded for free.

The pay TV company brought court action against Telstra, Optus, TPG and 46 other internet service providers (ISPs) in March, seeking to block access within Australia to the piracy sites which use 28 different addresses.

Foxtel said the sites – including 123hulu, HDO and ETTV – infringe on its copyright by offering free episodes of shows including Game of Thrones and prison drama Wentworth.

Game of Thrones is one of the shows illegally downloaded in Australia. Credit:HBO

On Tuesday, Federal Court justice John Nicholas agreed, ordering the sites be blocked for a period of three years, after which Foxtel can apply to have the orders extended.