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I want to know what IP ranges are belonging for example to the AS714.

How do I get this information?

I know how to do the reverse way, which is easy with whois. But the other way doesn't seem to be that easy.

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Do you want IP address ranges that originate on this AS? (Direct customers who don't have an AS) What about IP address ranges only reachable through this AS? (Customers that have their own AS.) What about IP address ranges reachable through this AS but also other provider ASes? (Multihomed customers.) –  David Schwartz Mar 28 '12 at 10:06
    
The purpose was to find out all the IP ranges my provider owns. I got this info by visiting bgp.potaroo.net/as1221/asnames.txt in order to find out the AS number and ripe.net/data-tools/stats/ris/routing-information-service in order to get all the IP ranges through the prefixes tab. Do you know other possibilities? –  Ian Mar 28 '12 at 11:01
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up vote 2 down vote accepted

Ok, I just found one simple way. You just put this http://bgp.he.net/[ASXXX]#_prefixes in your browser, where [ASXXX] is a certain AS and a number like this http://bgp.he.net/AS714#_prefixes.

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