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North American Network Operators Group Date Prev | Date Next | Date Index | Thread Index | Author Index | Historical Re: Mapping IP -> ASN
> 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.) Practical: Use show ip b n.n.n.n or equivalent on something carrying full routing. If you don't have anything carrying full routing do the equivalent on Digex's excellent MAE-East looking glass at http://nitrous.digex.net, or the cern router. Theoretical: Alternatively find out which AS it's meant to be originated in by looking at the origin attribute in the appropriate IRR using whois (assuming it's registered). Alex Bligh Xara Networks - - - - - - - - - - - - - - - - -
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