On Tue, Dec 15, 2009 at 12:18 AM, William Pitcock <neno...@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 >> <neno...@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.
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)
