The websites will be blocked as part of a government-sponsored trial of its filter technology that will start before Christmas and last six weeks.
The government has already identified 1300 websites that it wants to black list as part of the clean feeds scheme.
Communications Minister Stephen Conroy said the sites mostly contained child pornography and other unwatned content, including images and videos.
"While the ACMA blacklist is currently around 1300 URLs, the pilot will test against this list - as well as filtering for a range of URLs to around 10,000 - so that the impacts on network performance of a larger blacklist can be examined," se said.
The government is calling for ISP providers to express interest in taking part in the trial. Just one ISP has volunteered so far.