a newly established subscription service called IGN Insider (later IGN Prime), which led to the shedding of the name "Snowball" and adoption of IGN Entertainment on May 10, 2002. In June 2005, IGN reported having 24,000,000 unique visitors per month, with 4.8 million registered users through all departments of the site. IGN has been ranked among the top 500 most-visited websites according to Alexa. In September 2005, IGN was acquired by Rupert Murdoch's multi-media business empire, News Corporation, for $650 million. IGN celebrated its 10th anniversary on January 12, 2008. IGN was headquartered in the Marina Point Parkway office park in Brisbane, California, until it relocated to a smaller office building near AT&T Park in San Francisco on March 29, 2010. On May 25, 2011, IGN sold its Direct2Drive division to Gamefly for an undisclosed amount. Acquisition of UGO, sale to Ziff Davis In 2011, IGN Entertainment acquired its rival UGO Entertainment (owners of 1Up.com) from Hearst Corporation. Ultimately, News Corp. planned to spin off IGN Entertainment as a publicly traded company, continuing a string of divestitures for digital properties it had previously acquired (including MySpace and Photobucket). On February 4, 2013, after a failed attempt to spin off IGN as a separate company, News Corp. announced that it had sold IGN Entertainment to the publishing company Ziff Davis, which was recently acquired by J2 Global. Financial details regarding the purchase were not revealed. Prior to its acquisition by UGO, 1UP.com had previously been owned by Ziff Davis. Soon after the acquisition, IGN announced that it would be laying off staff and closing GameSpy, 1UP.com, and UGO in order to focus on its flagship brands, IGN and AskMen. Subsidiaries and spin-offs The role-playing video game interest website Vault Network was acquired by IGN in 1999. GameStats, a review aggregation website, was founded by IGN in 2004. GameStats includes a "GPM" (Game Popularity Metric) rating system which incorporates an average press score and average gamer score, as well as the number of page hits for the game. However, the site is no longer being updated. The Xbox interest site, TeamXbox, and the PC game website VE3D were acquired in 2003. IGN Entertainment merged with GameSpy Industries in 2005. The merger also brought the game download site FilePlanet into the IGN group; as of 2011 both FilePlanet and the GameSpy website still operate as video game-related web sites. IGN Entertainment acquired the