Data sources UOregon ANTC RouteViews BGP tables Oct. 31, 1999 (14 tables) Nov. 1, 2000 (18 tables) Nov. 1, 2001 (26 tables) unless otherwise specified Sampling for prefix analysis: from 6 months (1997-2001) to 2 hours (data from the end of 2001.) updates in continuous mode, all of Nov 2001