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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 in order to find out the AS number and in order to get all the IP ranges through the prefixes tab. Do you know other possibilities? – JohnnyFromBF Mar 28 '12 at 11:01

2 Answers 2

up vote 3 down vote accepted

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

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They're listed online with related details at (replace the ASN to get the equivalent details for any other ASN).

If instead of browsing them you'd rather grab them programmatically you can use the RADb whois server:

$ whois -h -- '-i origin AS714' | grep -Eo "([0-9.]+){4}/[0-9]+" | head
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