I think you will spend 20 seconds reading this post

Just a reminder for those of you who live in the 18th district and drive a vehicle – as of the 5 September 2016 you will need a resident’s parking permit to park on the street. General info on parking permits, the specific areas where it applies and the application process etc. is also available in English at https://www.wien.gv.at/english/e-government/transportation/parking/residents/parking-permit.html