Current series are used since 1995. Diplomatic vehicles have normal style plates in black on white, but with the number 0 followed by a hyphen, or above, a code denoting the embassy, (75 = Canada, 96 = Nicaragua) a hyphen and a serial of up to three digits (with 1 usually denoting the ambassador or head of mission).
Current series in US-size 17 = Embassy USA
Semi-diplomatic plate with B (Berlin) or BN (Bonn), an embassy code, (111 = Poland) a hyphen and a serial number from 300 to 999 in Berlin or from 1 to 999 in Bonn.
Former Series: until 2007 foreign consular plates, carried the code letters for the administrative division followed by a numeric serial from 900-999 or 9000-9999.
(F = Frankfurt am Main)