my(%manufacturers)= (
    Cisco        => qr/Cisco/i,
    'TUT Systems'=> qr/Expresso GS|MDU Lite/i,
    Gigalink     => qr/Gigalink/i,
    Huawei       => qr/Huawei/i,
    Orinoco      => qr/AP-2000|AP-1000/i,
    Lucent       => qr/WavePOINT/i,
    HP           => qr/HP/,
    Paradyne     => qr/Paradyne/i,
    Colubris     => qr/CN320/,
    SMC          => qr/TigerSwitch/,
    Ricoh        => qr/RICOH/,                         
);

$ref->{$host}{$ip}{'manufacturer'}='*unknown*';
while (($manu, $re)= each(%manufacturers)) {
    if (/$re/) {
        $ref->{$host}{$ip}{'manufacturer'}=$manu;
        last;
    }
}