For example, Account IDs have prefix
001 and have
15 alphanumeric digits. What are the values for the first and last records that can be represented in this format (as we understand Salesforce IDs today)?
Looking at some account ids ordered by
id asc in my dev org it seems the ordering sorts by 0-9 then a-z then A-Z.
0010a00001ACeQl 0010a00001CVCfp 0010a00001CVCfq 0010a00001CVCfr 001j0000003ZS1z 001j0000003ZS20 001j0000003ZS21 001j0000003ZS22 001j0000003ZS23
Therefore my guess is the range is between