ip-to-as

gistfile1.txt

#!/usr/bin/env ruby

# Small script that converts an IP address into its AS number. Also provides a
# helpful link to Geoff Huston's handy AS summary page

require 'ipaddr'
require 'resolv'

USAGE = "ip-to-as <ipv4/ipv6>"

def get_txt(hostname)
  Resolv::DNS.open do |dns|
    ress = dns.getresources hostname, Resolv::DNS::Resource::IN::TXT
    return ress.map(&:strings).join("\n")
  end
  return ""
end

if ARGV.size == 0
  $stderr.puts USAGE
  exit
end

begin
  ip = IPAddr.new(ARGV.shift)
rescue IPAddr::InvalidAddressError
  $stderr.puts USAGE
  exit
end

if ip.ipv4?
  hostname = ip.reverse.sub("in-addr.arpa", "origin.asn.cymru.com")
  res = get_txt(hostname)

  as_number = res[/\A(\d+)/, 1]
elsif ip.ipv6?
  hostname = ip.reverse.sub("ip6.arpa", "origin6.asn.cymru.com")
  res = get_txt(hostname)

  as_number = res[/\A(\d+)/, 1]
else
  $stderr.puts USAGE
  exit
end

if as_number
  puts "IP: #{ip}"
  puts "AS: #{as_number}"

  res = get_txt("AS#{as_number}.asn.cymru.com")
  as, country, registry, date, name = res.gsub('"','').split("|")

  puts "country: #{country.strip}"
  puts "registry: #{registry.strip}"
  puts "date: #{date.strip}"
  puts "name: #{name.strip}"
  puts "potaroo: http://bgp.potaroo.net/cgi-bin/as-report?as=AS#{as_number}&view=2.0"
else
  puts "no result"
end