DNS Clients list common list to run on all monitor probes: combine individual clients lists from all root name servers stratify routable IPv4 address prefix space DNS clents list for this study was created in September 2000 49,374 addresses passively collected from root servers 8,944 addresses from other CAIDA lists => cover more than 58,000 prefixes (out of nearly 90,000 in the BGP table) augmenting list as new data from root servers available