$ips = array();

$range = array();

$cidr = explode('/', $cidr);

$range['firstIP'] = (ip2long($cidr[0])) & ((-1 << (32 - (int)$cidr[1])));

$range['lastIP'] = (ip2long($cidr[0])) + pow(2, (32 - (int)$cidr[1])) - 1;

for ($ip = $range['firstIP']; $ip <= $range['lastIP']; $ip++) {

$ips[] = long2ip($ip);

}

return $ips;