and faster... 

use Benchmark qw(cmpthese);

use Socket;
use Sort::Key qw(ukeysort keysort);

my $n = 1000000;

my @address = map { join ('.', map {int rand 256 } 0..3) } 0..$n;

print "\@address populated\n";

sub gloryhackish {
  my @in = @address;
  my @sorted = map { $_ = inet_ntoa($_) }
    (sort (map {$_ = inet_aton($_)} @in));
}

sub ks {
  my @sorted = keysort { inet_aton($_) } @address;
}

sub uks {
  my @sorted = ukeysort { /^(\d+)\.(\d+)\.(\d+)\.(\d+)$/;
                          ($1 << 24) + ($2 << 16) + ($3 << 8) + $4 } @
+address;
}

cmpthese -1, { gloryhackish => \&gloryhackish,
               keysort => \&ks,
               ukeysort => \&uks };

[download]
on my PC, the results for 1 million elements are: 
             s/iter gloryhackish      keysort     ukeysort
gloryhackish   24.4           --         -29%         -48%
keysort        17.2          42%           --         -26%
ukeysort       12.7          92%          35%           --

[download]

In reply to Re: Sorting IP addresses, lots of them, quickly by salva
in thread Sorting IP addresses, lots of them, quickly by gloryhack

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