Barcode Scan Record ID

Barcode Scan Record ID

It looks like record IDs are 19 digit numbers. When using the IOS apps (iPhone and iPad tested) it will not scan barcodes that long. Most I can get it to scan is 11 digit numbers.
 
Is there a setting to restrict the number of digits assigned to the record ID when created?
 
Or maybe someone can tell me about the structure of the record IDs? We only have 140 records so far, but they all start with the same 14 digits. The first 8 digits being 3014701 followed by 7 zeros. This leads me to believe the numbers might correspond to the application ID, table, etc. Or are they just random?
 
If I just use the 5 right digits, will this cause a problem for me if/when I go over 99,999? I would probably never do so in this application but don't want to make sure before I make a decision that bites me in the butt 5 years from now.