- Johann Wolfgang Goethe-Universit t Frankfurt am Main Fachbereich Informatik (20) Conversion of German Postleitzahlen ZIP - codes via xplz 3.4 look here for international zip - code sources Please convert the german umlauts ( oe, ae, u ue, ss )by yourself. Please convert abbreviations like Gauss-str. to Gauss-strasse . (I found that xplz 3.4 dont expand this:-( This should be filled out in any ...www.informatik.uni-frankfurt.de/plz/plzrequest.uk.html