check for your provider in the double-character .de domains...

denic_new_domains.php

<?php

for ($a=0;$a<26;$a++) {
  for ($b=0;$b<27;$b++) {
    $fc=chr($a+97);
    if ($b==0) {
      $sc="";
    } else {
      $sc=chr($b+96);
    }
    $dom=$fc.$sc.".de";
    $repeat=true;
    while ($repeat) {
      echo $dom;
      $res=shell_exec("whois $dom ");
      $repeat=false;
      if (preg_match("/Error:/",$res)==1) {
        echo " : [FAIL]";
        sleep(10);
        $repeat=true;
      } else {
        preg_match("/Name: +(.+)/", $res, $name);
        $name=$name[1];
        preg_match("/Organisation: +(.+)/", $res, $org);
        $org=$org[1];

        echo " : $name ($org) ";
        if (preg_match("/[Nn]etzquadrat/", $res)==1) {
          echo "[MATCH!]\n";
        }
      }
      echo "\n";
    }
  }
}