| protected _ipIsUnique ( string $ip ) : boolean | ||
| $ip | string | The IPv4 IP address to check. |
| return | boolean | True if the IP address is globally unique, otherwise false. |
protected function _ipIsUnique($ip)
{
// Make sure it's sane
$parts = explode('.', $ip);
if (count($parts) != 4) {
return false;
}
// zero config IPs RFC3330
if ($parts[0] == 169 && $parts[1] == 254) {
return false;
}
// reserved RFC 1918
if ($parts[0] == 10 || $parts[0] == 192 && $parts[1] == 168 || $parts[0] == 172 && ($parts[1] >= 16 && $parts[1] <= 31)) {
return false;
}
// Loopback
if ($parts[0] == 127) {
return false;
}
return true;
}