On Tue, 25 Nov 2014 17:36:47 +0200, Martin T <m4rtntns@gmail.com> said: > Last but not least, maybe there is altogether a more reliable > way to understand the relationship between the operators than > aut-num objects(often not updated) in RIR database? The first thing to do is look and see if the policy of, e.g. AS65133 is consistent with what you see there. I suspect you'll find a lot of mismatches but I don't know if that has been studied systematically, but it should be simple to do. Next, much more data intensive, is trawl through the route views data and see to what extent the actual updates seen are consistent with the RIR objects, and also see what (topological, not financial as Valdis points out) relationships they imply that are not present in the RIR database. -w