Lyndon Nerenberg wrote : -> Is there a tool available that will take an IP address and return the -> ASN attached to that network? I've been in situations before where this -> information would be useful, but not having access to the BGP routing -> information I'm not sure how to do this? (I've looked around some -> "likely" web sites - such as Merit - but haven't found anything.) -> -> The pressing need is for the ASN associated with 198.161.92.0. This -> network is connected to I*star, but I can't tell which of I*star's -> three ASNs it's homed on. (And they aren't being responsive to queries.)
Versions of traceroute that support the "A" option are also a nice quick way to get this info. Cisco routers do this by default.
Only when that router is running full tables. When traceroute is run from routers that aren't running BGP, you just get hostnames/times. I'd suspect that the only way to get traceroute with ASN's is when the machine you're coming from (cisco routers, for example) know the tables. There is a "public" cisco at route-server.cerf.net - telnet there and traceroute out :) -- jamie g. k. rishaw | jamie@multiverse.com | home e-mail:jamie@arpa.com url-free sig file | corporate support svcs. | "I had a dream .. there was corp: 216.771.0002 |"religious right" is neither| an info-mercial selling an C4 48 1B 26 18 7B 1F D9 BA C4 9C 7A B1 07 07 E8 | awk script for $29.95" -rdm