Here's a quick function I wrote to generate IP address ranges using recursion.
function iprange($oct, $prefix=""){
for($i=1;$i<256;$i++){
if($oct == 1) print("$prefix.$i\\n");
else iprange($oct - 1, "$prefix.$i");
}
}
Just call it with the number of octets you want to generate and the beginning of the IP range.
Example:
iprange(2, "127.0");
Output:
127.0.1.1
127.0.1.2
127.0.1.3
127.0.1.4
127.0.1.5
…
127.0.255.254
127.0.255.255
Enjoy 
December 29th, 2007 at 2:37 pm
Nice. But what about 127.0.0.1, and you could certainly make that $oct thing easier…
My take:
function iprange($prefix){
$dots = substr_count($prefix,".");
if ($dots == 3) echo($prefix);
else {
$oct = (3 - $dots);
if ($oct == 1) $i = 1;
else $i = 0;
for($i;$i<=255;$i++){
if($oct == 1) echo("$prefix.$i\n");
else iprange("$prefix.$i");
}
}
}
iprange("127.0");
December 29th, 2007 at 4:02 pm
I like my 4-line function better, but yeah yours is nice too
December 29th, 2007 at 7:58 pm
are you some kind of homo or something fish
December 29th, 2007 at 8:51 pm
I don't know, you're the one reading my BLOG, fag.
February 18th, 2008 at 11:07 am
This is essentially the same code as in your dictionary generating function.