IP to authoritative CIDR webservices
William Pitcock
nenolod at systeminplace.net
Tue Dec 15 05:18:23 UTC 2009
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 at 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
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