Created
October 12, 2021 03:32
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ip-to-as
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#!/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 |
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