Below you will find the authorities responsible for nostrification as well as the documents required in each federal state:
Burgenland: Office of the Burgenland Provincial Government: Contact
Carinthia: Office of the Carinthian Provincial Government: Contact & Application
Lower Austria: Office of the Lower Austrian Provincial Government: Contact & Application
Salzburg: Office of the Salzburg Provincial Government: Contact
Styria: Office of the Styrian Provincial Government: Contact & Documents
Tyrol: Office of the Tyrolean Provincial Government: Contact
Upper Austria: Office of the Upper Austrian Provincial Government: Contact
Vienna: Municipal Administration of the City of Vienna: Contact & Documents
Vorarlberg: Office of the Vorarlberg Provincial Government: Contact