[120270] in North American Network Operators' Group
Re: IP to authoritative CIDR webservices
daemon@ATHENA.MIT.EDU (William Pitcock)
Tue Dec 15 00:19:20 2009
From: William Pitcock <nenolod@systeminplace.net>
To: Paul Ferguson <fergdawgster@gmail.com>
In-Reply-To: <6cd462c00912142112l5903b68flaaa23a04e62b69d6@mail.gmail.com>
Date: Mon, 14 Dec 2009 23:18:23 -0600
Cc: nanog@nanog.org
Errors-To: nanog-bounces+nanog.discuss=bloom-picayune.mit.edu@nanog.org
Hi,
On Mon, 2009-12-14 at 21:12 -0800, Paul Ferguson wrote:
> 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/
Looks like their WHOIS server in verbose mode will do the trick for what
I want, as it provides predictable output. Thank you.
William
