The old city of Vienna and the surrounding districts (1 to 9 and 20) are pay & display short stay parking zones. When you park here you need a valid parking permit behind your windscreen from the first minute of your stay. The signs indicating the short stay parking zones are only posted where you enter these districts. In shopping streets it is necessary to watch for signs indicating exceptions to days on which zones apply and maximum length of stay. Parking permits are available from most tobacconists and banks, from railway stations and Vienna Lines ticket offices.
more parking-in-Vienna details: www.parkeninwien.at