Another confusing thing is doing this: xxxxx-xxxxx-xxxxx-xxxxx Instead of something like this: xxxxx-xx-xxxxx-xxx-xxxxx Something could also be said

Another confusing thing is doing this: xxxxx-xxxxx-xxxxx-xxxxx Instead of something like this: xxxxx-xx-xxxxx-xxx-xxxxx Something could also be said about such scheme lacking the embedding of a checksum. Here's an IBAN (bank account number) in the EU (which thankfully are using a checksum as part of the account number): LU29 0022 1712 5582 7000 ^^ || two checkdigits Also some companies think they're "smart" because they pick numbers like this: LU29 002 0000 0001 8000 Repeating the same digit, usually a zero, a shitload of time ain't smart. It's fucking dumb.