All, In response to requests from many folks asking for prefix to AS mappings, routeviews is now providing 2 new services mapping and address or prefix to its origin AS and to its ASPath. These services are available via two zones: (i). asn.routeviews.org asn.routeviews.org maps an address or prefix into its origin AS, prefix, and prefix length, as seen by route-views2.routeviews.org (the data is held in TXT records). For example, the following command % dig txt 223.128.asn.routeviews.org returns (among other things) 223.128.asn.routeviews.org. 86400 IN TXT "3582" "128.223.0.0" "16" The syntax here is: "AS" "Prefix" "Prefix Length" (ii). aspath.routeviews.org aspath.routeviews.org is similar to asn.routeviews.org, except that it maps an address or prefix into the ASpath (rather than origin AS), prefix, and prefix length, as seen by route-views2.routeviews.org (again, the data is held in TXT records). For example, the following command % dig txt 223.128.aspath.routeviews.org returns (among other things) 223.128.aspath.routeviews.org. 86400 IN TXT "286 209 3356 3701 3582" "128.223.0.0" "16" The syntax here is: "ASPath" "Prefix" "Prefix Length" These zones are built twice per-day, 11:45 and 23:45 UTC. Finally, please let us know (help@routeviews.org) if you have questions, comments or suggestions for ways we might otherwise improve this service. One note: note that these zones are quite large, and reloading these produces a period of a few minutes during which the server may not reply. Thanks, Dave