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#!/usr/bin/env perl

use strict;
use warnings;

use AWS::Networks;
use Net::CIDR::Set;

my $ip = $ARGV[0] or die "Usage $0 IP\n";

my $nets = AWS::Networks->new;

my @matches = grep { Net::CIDR::Set->new($_->{ip_prefix})->contains($ip) } @{ $nets->networks };

if (not @matches) {
  print "This IP range doesn't seem to belong to AWS\n";
  exit 1;
} else {
  foreach my $range (@matches) {
    print "Service: $range->{service}\n";
    print " Region: $range->{region}\n";
    print "  Block: $range->{ip_prefix}\n";
    print "\n";
  }
  exit 0;
}