Anyone knows IP of bots?

Hi,
Anyone here knows the IP of yahoo, msn, google bots?
I checked my access logs and got the following.
65.54.188.103 // msn
72.30.107.152 // yahoo
74.6.74.176 // yahoo
72.30.111.72 //yahoo
72.30.103.225 //yahoo
66.249.65.37 //google

Yahoo's IP seem to change every visit. What's that about?
Secondly, are there any more "good SE bots" which hit your sites and can you give an IP for them?
Thank you

 

try http://www.iplists.com/

or http://www.briandunning.com/seo/

that should help a little i hope.

 

WOW! That's exactly what I was looking for!
Sending some green to you. Thank you

 

Here's a list of IP ranges for SE bots:

As a bonus, here's some code to use that list with. Save the IP list above as "iplist.txt" and use the following function to determine if a visitor on your site is from the list above:

function is_bot() {
  $ip = getenv(REMOTE_ADDR);
  $ip_ocets = explode('.', $ip);
  $temp = array_map('rtrim', file('iplist.txt'));
  $j = count($temp);
  for ($i = 0; $i < $j; $i ++) {
    if ((strstr($temp[$i], ';') === FALSE) && ($temp[$i] > '')) {
     $ip_list[] = $temp[$i];
   }
  }
 
  unset($temp);
 
  $is_bot = FALSE;
 
  $i = 0;
  while ($i <= count($ip_list)-1) {
    $ip_range = explode(' - ', $ip_list[$i]);
    $ip_range_min_ocets = explode('.', $ip_range[0]);
    $ip_range_max_ocets = explode('.', $ip_range[1]);
    $x = 0;
    while ($x <= count($ip_range_max_ocets)-1) {
      if (($ip_ocets[0] >= $ip_range_min_ocets[0])
          && ($ip_ocets[0] <= $ip_range_max_ocets[0])
         && ($ip_ocets[1] >= $ip_range_min_ocets[1])
         && ($ip_ocets[1] <= $ip_range_max_ocets[1])
         && ($ip_ocets[2] >= $ip_range_min_ocets[2])
         && ($ip_ocets[2] <= $ip_range_max_ocets[2])
         && ($ip_ocets[3] >= $ip_range_min_ocets[3])
         && ($ip_ocets[3] <= $ip_range_max_ocets[3]))
       {$is_bot = TRUE; break;}
       else {$x++;}
    }
   if ($is_bot) {break;} else {$i++;}
  }
  return $is_bot;
}

Code (markup):

Implementation is simple. At the beginning of your php page:

<?
$isbot = is_bot();
if ($isbot) {
  ...do something here ;
} else {
  ...do something else here ;
}
?>

Code (markup):

 

what would be the point of finding the search bot ips?