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blockfinder by Jacob Appelbaum <firstname.lastname@example.org>, David <email@example.com> "All that Blockfinder does is allow you to identify, contact and potentially hack into every computer network in the world." - Rolling Stone, August 2010  Contrary to popular media claims, blockfinder is a simple text based console tool that returns a list of netblocks for a given country. It does this by fetching the following lists of allocations: ftp://ftp.arin.net/pub/stats/arin/delegated-arin-latest ftp://ftp.ripe.net/ripe/stats/delegated-ripencc-latest ftp://ftp.afrinic.net/pub/stats/afrinic/delegated-afrinic-latest ftp://ftp.apnic.net/pub/stats/apnic/delegated-apnic-latest ftp://ftp.lacnic.net/pub/stats/lacnic/delegated-lacnic-latest The list of ISO codes is ISO 3166-1 as found here: http://www.iso.org/iso/home/standards/country_codes/country_names_and_code_elements_txt-temp.htm http://en.wikipedia.org/wiki/ISO_3166-1 blockfinder has two methods of operation: Update the lists of network object allocations Returning a list of all netblocks (or asn, etc) for a given country To use blockfinder, first create or update the cache: blockfinder -i Once you have a proper cache, search for the desired resource in the country of your choice: ./blockfinder -v -t mm Additionally, to filter results for a specific protocol you can use a selector: ./blockfinder -v -t mm:ipv4 On Windows (in cmd, PowerShell and 4nt) one may find blockfinder.bat useful: blockfinder.bat  http://www.rollingstone.com/culture/news/17389/192242