The Astrophysics Source Code Library (ASCL), founded in 1999, is a free online registry of source codes used in astrophysics research. It is hosted on the Astronomy Picture of the Day (APOD) discussion forum and is accessible at http://ascl.net. The ASCL contains over 500 codes, with records that are citable and indexed by ADS. The library continues to grow and is actively maintained by its editors and advisory committee. As of October 31, 2012, the ASCL had 546 codes indexed, making it the largest resource for astrophysics software. The ASCL actively seeks out new and old codes used in research published in or submitted to refereed journals. It is housed on a phpbb board and offers full-text iterative searching. Since January 2012, the SAO/NASA Astrophysics Data System (ADS) has indexed ASCL entries, making them easily discoverable and citable. The ASCL was created in 1999 and collected 37 codes by 2002. In mid-2010, it moved to a new site under the direction of founder Robert Nemiroff and new editor Alice Allen, leading to a period of expansion with an average of 18 codes added monthly. An Advisory Committee was established in 2011, including members from various institutions. At ADASS, a demonstration table was set up to provide information on the ASCL, answer questions, distribute materials, and accept code submissions. The ASCL is increasingly used by the community, with entries cited in papers, used in pre-prints, and linked to software in publications. The ASCL's growth and activity have been increasing, with more codes being added by the editors in the past two years. The ASCL's activity is influenced by blog posts, conference presentations, and links from APOD. Google Analytics was installed in 2011 to measure site activity, showing a trend of increasing pageviews. Presentations and materials from the demonstration are available on the ASCL blog or as downloads. The ASCL thanks the American Astronomical Society for its support.The Astrophysics Source Code Library (ASCL), founded in 1999, is a free online registry of source codes used in astrophysics research. It is hosted on the Astronomy Picture of the Day (APOD) discussion forum and is accessible at http://ascl.net. The ASCL contains over 500 codes, with records that are citable and indexed by ADS. The library continues to grow and is actively maintained by its editors and advisory committee. As of October 31, 2012, the ASCL had 546 codes indexed, making it the largest resource for astrophysics software. The ASCL actively seeks out new and old codes used in research published in or submitted to refereed journals. It is housed on a phpbb board and offers full-text iterative searching. Since January 2012, the SAO/NASA Astrophysics Data System (ADS) has indexed ASCL entries, making them easily discoverable and citable. The ASCL was created in 1999 and collected 37 codes by 2002. In mid-2010, it moved to a new site under the direction of founder Robert Nemiroff and new editor Alice Allen, leading to a period of expansion with an average of 18 codes added monthly. An Advisory Committee was established in 2011, including members from various institutions. At ADASS, a demonstration table was set up to provide information on the ASCL, answer questions, distribute materials, and accept code submissions. The ASCL is increasingly used by the community, with entries cited in papers, used in pre-prints, and linked to software in publications. The ASCL's growth and activity have been increasing, with more codes being added by the editors in the past two years. The ASCL's activity is influenced by blog posts, conference presentations, and links from APOD. Google Analytics was installed in 2011 to measure site activity, showing a trend of increasing pageviews. Presentations and materials from the demonstration are available on the ASCL blog or as downloads. The ASCL thanks the American Astronomical Society for its support.