Wiimmfi/Nice ID
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Nice ID is a concept of Wiimmfi to make long numeric identifiers easier to read and to remember. A Nice ID consists always of 2 letters followed by 2 digits. So 26*26*10*10=67600 different nice ids are available. They are used cyclic. A reset to AA00 happens only every few weeks.
C algorithm
The following algorithm shows, how a numeric id is translated to a Nice ID. The algorithm includes, that the number is truncated by modulo 67600.
char nice[5]; nice[0] = 'A' + id / 2600 % 26; nice[1] = 'A' + id / 100 % 26; nice[2] = '0' + id / 10 % 10; nice[3] = '0' + id % 10; nice[4] = 0;