The first part is the ISO 3166-1 code DE for Germany, the second part is two-digit-alphabetic.
Decoding table
DE-BE Berlin (city-state)
DE-BR Brandenburg
DE-BW Baden-Württemberg
DE-BY Bavaria (Bayern)
DE-HB Bremen (city-state)
DE-HE Hesse (Hessen)
DE-HH Hamburg (city-state)
DE-MV Mecklenburg-Western Pomerania (Mecklenburg-Vorpommern)
DE-NI Lower Saxony (Niedersachsen)
DE-NW North Rhine-Westphalia (Nordrhein-Westfalen)
DE-RP Rhineland-Palatinate (Rheinland-Pfalz)
DE-ST Saxony-Anhalt (Sachsen-Anhalt)
DE-SH Schleswig-Holstein
DE-SL Saarland
DE-SN Saxony (Sachsen)
DE-TH Thuringia (Thüringen).
See also
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