https://www.bennysoft.net/news/bank-sort-codes-germany-2009-03
The bank sort code file is updated by the Deutsche Bundesbank
quarterly. The file with ending date of January 19, 2009 is valid from
March 9, 2009 until June 7, 2009. The next update with ending date of
April 16, 2009 will be finished in May 2009.