This: 
#!/usr/bin/perl

use strict;
use Socket;

unlink for </tmp/prefix.*.ips>;

my %prefixes;

while( <> ) {
  while( /((\d+)\.\d+\.\d+\.\d+)/g ) {
    open my $f, '>>', "/tmp/prefix.$2.ips";
    $prefixes{$2}++;
    print $f inet_aton($1), "\n"
  }
}

for ( sort {$a <=> $b} keys %prefixes ) {
  my %addresses;
  open my $f, '<', "/tmp/prefix.$_.ips";
  while( <$f> ) {
    chomp;
    $addresses{$_}++
  }
  
  printf "%-20.20s => %d\n", inet_ntoa($_), $addresses{$_} for sort {$
+a <=> $b} keys %addresses
}

unlink "/tmp/prefix.$_.ips" for keys %prefixes

__END__
64.233.169.17        => 1
64.233.169.18        => 1
75.101.152.211       => 2
85.17.189.130        => 4
127.0.0.1            => 8
174.129.112.136      => 1
174.129.233.130      => 1

[download]
should work Ok (tested here with far less than a billion IPs). If you think it's still hogging the memory, you can just substritute
  while( /((\d+)\.\d+\.\d+\.\d+)/g ) {

[download]
for
  while( /((\d+\.\d+)\.\d+\.\d+)/g ) {

[download]
and be done with it.
[]s, HTH, Massa (κς,πμ,πλ)

In reply to Re: Working with large amount of data by massa
in thread Working with large amount of data by just1fix

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