[6135] in North American Network Operators' Group
Re: Mapping IP -> ASN
daemon@ATHENA.MIT.EDU (Jim Van Baalen)
Fri Nov 15 15:53:02 1996
From: Jim Van Baalen <vansax@atmnet.net>
To: nanog@merit.edu
Date: Fri, 15 Nov 1996 11:57:47 -0800 (PST)
Cc: lyndon@esys.ca
In-Reply-To: <199611151740.RAA26485@diamond.xara.net> from "Lyndon.Levesley" at Nov 15, 96 05:40:00 pm
>
>
> 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.
ex.
sd-gw-1>traceroute cisco.com
Translating "cisco.com"...domain server (207.67.247.4) [OK]
Type escape sequence to abort.
Tracing the route to cisco.com (198.92.30.31)
1 agis-atmnet.losangeles.agis.net (206.62.12.49) [AS 4200] 4 msec 4 msec 4 msec
2 a5-0.1009.santaclara3.agis.net (205.254.168.249) [AS 4200] 16 msec 12 msec 12 msec
3 mae-w.bbnplanet.net (198.32.136.14) 36 msec 32 msec 52 msec
4 paloalto-br2.bbnplanet.net (4.0.1.13) [AS 1] 32 msec 164 msec 240 msec
5 su-pr2.bbnplanet.net (131.119.0.218) [AS 200] 232 msec 36 msec 32 msec
6 cisco.bbnplanet.net (131.119.26.10) [AS 200] 36 msec 36 msec 36 msec
7 sj-wall-2.cisco.com (192.31.7.34) [AS 109] 36 msec 64 msec 36 msec
8 sj-eng-corp2.cisco.com (198.92.1.130) [AS 109] 40 msec 40 msec 44 msec
9 cisco.com (198.92.30.31) [AS 109] 36 msec 32 msec 33 msec
sd-gw-1>
Jim
