A nevadí ti, že je z rozsahu privátních IP adres? Krom toho tam máš i vysvětlení.

These addresses are in use by many millions of independently operated networks, which might be as small as a single computer connected to a home gateway, and are automatically configured in hundreds of millions of devices. They are only intended for use within a private context and traffic that needs to cross the Internet will need to use a different, unique address.