IP to authoritative CIDR webservices

Tim Wilde twilde at cymru.com
Tue Dec 15 08:43:47 CST 2009


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On 12/15/2009 12:18 AM, William Pitcock wrote:
>> http://asn.cymru.com/
> 
> Looks like their WHOIS server in verbose mode will do the trick for what
> I want, as it provides predictable output.  Thank you.

For the record, the prefix you find here will be the prefix our BGP view
(from peers around the globe) sees that IP announced as, which is not
necessarily the same as the RIR allocated prefix.  And you can find full
details of all of the access methods for this service here:

http://www.team-cymru.org/Services/ip-to-asn.html

Please make note of the notice at the top of the page regarding use in
software, applications, and devices - if we have advance notice we can
make sure we're not going to accidentally block you or your users, but
only if you get in touch with us first. :)

Thanks,
Tim Wilde

- -- 
Tim Wilde, Senior Software Engineer, Team Cymru, Inc.
twilde at cymru.com | +1-630-230-5433 | http://www.team-cymru.org/
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