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Which callsign can I apply for?
The callsign plan of the Bundesnetzagentur (BNetzA, the German regulator) sets which prefixes and digits are used for what. Pick a purpose and a class and you see straight away which series are possible, how full they are and whether your preferred suffix is still free in them.
Which prefixes can I use?
The series (prefix and digit) sets purpose and class. That is why you get a new callsign from a different series when you upgrade to a higher class.
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The series in detail
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Is my preferred suffix free?
Type just the suffix, say MH. It is checked in every series the finder above is showing right now, for example DO1MH to DO9MH.
Not listed does not mean available. Returned callsigns stay blocked for a while, and callsigns are only assigned on application: that decision is the Bundesnetzagentur's alone. Who holds a callsign is not shown here, only numbers.
What kind of callsign is this?
Enter a callsign, also with an addition such as /Tp or as a short-term licence like DL/PA3XYZ. It is classified by the plan only, without the holder.
All series at a glance
Prefix DA to DR (without DE and DI) times digit 0 to 9. Colour by purpose, the class in the cell, hatched: being phased out. Highlighted are the series the finder is showing right now; a click sets the finder to that series.
What else the callsign plan says
The rules besides the series, in short. The Bundesnetzagentur's PDF is binding. Terms are also explained in the glossary.
How to apply
You apply for a callsign at the Bundesnetzagentur, and that is also where you name your preferred callsign. Forms and fees are on the amateur radio page of the Bundesnetzagentur (in German). Whether a callsign is already taken is shown by the callsign lookup.