You can always query ARIN or RIPE whois database.

Jim Devane wrote:
> 
> hi,
> 
> i am wondering if anyone knows how the route is able to provide
> the AS in a traceroute. I figure that it is querying it's own
> BGP table, kinda doinga  mini-"sh ip bgp x.x.x.x" sort of deal.
> 
> the reason I am asking, I am trying to write a traceroute
> program and would like to include AS info in it. My own traces
> from a linux or windoes box don't include this info...
> 
> I considered getting zebra going and querying the server's BGP
> table
> but I am hoping there is a nifty UDP probe or ICMP message that
> will return that info.
> 
> any suggestions? 


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