by the time netscape assumed stewardship, the open directory project had about 100,000 urls indexed with contributions from about 4500 editors. on october 5, 1999, the number of urls indexed by dmoz reached one million. according to an unofficial estimate, the urls in dmoz numbered 1.6 million in april 2000, surpassing those in the yahoo! directory. dmoz achieved the milestones of indexing two million urls on august 14, 2000, three million listings on november 18, 2001 and four million on december 3, 2003. as of april 2013 there were 5,169,995 sites listed in over 1,017,500 categories. on october 31, 2015, there were 3,996,412 sites listed in 1,026,706 categories.