Hi Johannes, ] > Anybody have a pointer to scripts to map IP to AS? ] Grab a routing table snapshot from the routeviews archive and run it ] through parse_bgp_dump from CAIDA's CoralReef package. Then use ] CAIDA::ASFinder or Net::Patricia to do the lookups. In fact I have 2 scripts to do just this. - Script #1 uses a route-server for a smallish list of IPs. - Script #2 uses the method listed above and pipes IPs into the CAIDA lookup tree of a BGP table offline. Once you've installed CoralReef it's really not much more work to get the customization you need for lookups. Contact me off-list if you're interested in either one. Cheers, -- steve