In April 2013, it was revealed that an IP address used by more than 1,200 websites had been censored by certain Internet service providers. It was discovered by the Melbourne Free University which was one of the sites censored. It was later revealed that the Australian Securities and Investment Commission (ASIC) had ordered the censorship of the address to target a fraud website, and that the remaining websites were censored unintentionally. The block was subsequently lifted. ASIC subsequently revealed that it had used its censorship powers 10 times over the preceding 12 months, and that a separate action taken in March had also caused the inadvertent temporary censorship of around 1000 untargeted active sites, as well as around 249,000 sites that hosted "no substantive content" or advertised their domain name for sale. The censorship was carried out under the section 313 legislation, and censorship notices were sent to four or five ISPs on each occasion.