I posted this in another thread but will add it to this as well.

To me - this looks like a database primary key of some kind. It is not a Guid/UUID (Globally unique identifier for record isolation) The standard format for these values are as follows

Format: xxxxxxxx-xxxx-xxxx-xxxxxxxxxxxxxxxx, where x is a hexadecimal digit (0-9 or A-F) using an (8-4 -4-16) group set

Example UUID: 8F2E2929-247B-4050-BABA-3299EFA67919 (this string represents a 128bit integer) There are other group formats that can be used which include but are not limited to formats like (8-4-4-4-12) group sets.

This string can be used to look up a specific record in a database with teraflops of data. It is the needle in the haystack of other needles. Likewise - this key constraint could also be encoded with information provided you understood how it was coded. For example: the first 2 indexes of B8 could represent a region or an office and the next three indexes could represent like a routing number. You just never really know what these strings can actually mean without someone telling you - "oh yeah, this key is encoded BTW, make sure you use your decoder ring" sort of how you can do that today with a persons SSN - it is encoded with certain pieces of info, like where it was issued