You feed it with an IP, a hostname or an AS-number, and serversniff tells you
- Uplink-ASses
- Downlink-ASses
- Known subnets on this as
Those of you familiar with AS-geography might argue that there is no real way to determine, which of the peered AS are uplinks and downlinks. You are right: We are guessing. But try it out: We're usually guessing right.
Like always, this is not entirely my own work.
Serversniff has a routing-database that relys on routing-table from de-cix and routeviews. Thanks to those guys for providing the routes. The routing data is parsed with Marco d'Itri's Zebra-Parser. Thanks Marco! The uplink/downlink-guess is relying on Geoff Hustons CidrReport. Thanks Geoff.
Please note that we do cache whois-data for the networks shown, and the routing-data might also be rather outdated, though we usually update the routing-table once a day.
I tried to fix what annoyed me on other AS-related sites:
Robtex seems to work on new, yet unlinked scripts, see http://www.robtex.com/asmacro/as-tiscalicust.html.
What's left to do is some graphs (i'm working on these) and a maybe bit of speed (it's fast enough for me, though).
If you know any other as-analyzers or if you feel i missed something: drop me a note at thomas.springer@serversniff.net or leave a comment.
tom
