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Hi! :)I found this here (http://salesforce.stackexchange.com/questions/1653/what-are-salesforce-ids-composed-of)"The algorithm to convert from a 15 character Id to an 18 character Id is: (Source (http://boards.developerforce.com/t5/General-Development/GetUserInfoResult-getOrganizationId-does-not-equal-OrgID/m-p/134530)- I'm sure there used to be official documentation on how do this.) 1. Divide the 15 char into 3 chunks of 5 chars each.
2. For each character give that position a value of 1 if uppercase, 0 otherwise (lowercase or number).
2. Combine the bits from each chunk into a 5 bit integer where the rightmost bit is the most significant bit. This will yield a number between 0 and 31 for each chunk.
4. Construct an array that contains the sequence of capital letters A-Z and 0-5 (26 + 6 = 32 possible values).
5. Use the integer from each chunk to choose a character from the array.
6. Append the resulting 3 characters, in chunk order, to the end of the 15 char id.
In a formula there is the CASESAFEID function that will perform this algorithm.
You can apply this algorithm to some sample IDs to see how it doesn't really function as a checksum or checkdigit. For example, if you exclude the alpha characters, every ID between 001100000000001 and 001999999999999 will have the suffix AAA. Infact, you get the same suffix if you include any lowercase alpha characters as well. The suffix will only change in the presence of uppercase characters. It is basically encoding which of the 5 characters that each suffix character represents are uppercase."I hope that helps you :D
