Re: IP to authoritative CIDR webservices

[Paul Ferguson <fergdawgster () gmail com>]

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On Mon, Dec 14, 2009 at 8:57 PM, William Pitcock
<nenolod () systeminplace net> wrote:

> Hi,
>
> Does anyone know of a webservice that converts a given IP into the
> public CIDR range that belongs to?  I am developing a tool where IP to
> CIDR conversion based on RIR whois data would be useful for implementing
> filtersets.

WHOIS?

Alternatively, use the Team Cymru tool to find the AS, then the CIDR Report
portal to determine all perfixes originated by the AS in question:

http://asn.cymru.com/
http://www.cidr-report.org/

Apologies if you are seeking other magic...

- - ferg

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-- 
"Fergie", a.k.a. Paul Ferguson
 Engineering Architecture for the Internet
 fergdawgster(at)gmail.com
 ferg's tech blog: http://fergdawg.blogspot.com/