The German post office prints object codes on letters around a machine assortment and a forwarding to make possible. These codes consist of one-follow from brightly orangenen, 5mm high lines, which are letter-printed on the lower edge. The arrangement and number of lines indicate parts of that address of the receiver.

The oldest form of the code consists of 5 segments: the 4 numbers of the postal zip code as well as a number those the checksum represents. A segment builds up itself out for 5 lines, by which in each case 2 lines per segment are omitted. Depending on, at which place is omitted, Ziffer.Der first line results has the value 0, the second 1, then the Werte2,4 and 7.Fehlen second and the third line e.g. followed, arise the number 1+2=3.Fehlen the lines four and five, are thus the sum of the values 4+7=10, stand-standing this for the number 0. Behind each segment in each case Trennstrich.Der is code

01247-01247-01247-01247-01257-
||| || | ||| | ||| ||| ||| |
  0 5 5 3 7
  

the numbers therefore results in 0, 5, 5, 3 of the postal zip code, as well as the The postal zip code of the address reads 3550, is thus in more in reverse sequence-coded. On the basis of the checksum of the postal zip code one the check digit by computation difference to the next-round number: Check digit = 10 - (checksum mod 10)

The code was modified several times and extended. Been added be under different codes for the road and postal zip code. New components are coded also as binary words four digit (little endian). Completely right (partially followed of two additional lines) thereby further the original part described above stands code with matching segments instead of the Trennstriches also for in blanks is used. Example:

    - 8421.8421-8421.8421.8421-01247.01247.01247.01247.01247-01247-- | | | | | ||| | || || || | | | || ||| || | ||| | | | | || ||| ||| (post office-internally) 2 3 4 5 6 1 4 0 5 3 7 "--House NR"---Road---'------Postal zip  

Results in: Check digit 7, postal zip code 35031, road 456, house number 23

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