On Tue, Dec 15, 2009 at 12:18 AM, William Pitcock <nenolod@systeminplace.net> wrote:
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:
Looks like their WHOIS server in verbose mode will do the trick for what I want, as it provides predictable output. Thank you.
there's also the lightish weight routeviews DNS zone data: $ host -W 6 -R 10 -t txt 50.35.2.128.asn.routeviews.org 50.35.2.128.asn.routeviews.org descriptive text "9" "128.2.0.0" "16" 128.2.35.50 lives in 128.2.0.0/16 from ASN9 -chris (thanks to joe/joel/dmm and capitan kemp)