Other What do the UPS reference numbers mean?

[MareLuce]

From this UPS status,

What do all the reference numbers beyond my phone # and order # mean?
Behind the black box ( I assume the reference #'s contain SPI ) are 6 numbers:
1) 11 digits
2) 10 digits
3) 11 digits
4) My phone # xxxyyyzzzz
5) 10 digits
6) My order number Wxxxxxxx

I took that screen shot a couple days ago. Not sure what I did to make that "Additional Information" section appear, but I don't see it now in tracking.

 

[DeltaMac]

Reference numbers on a UPS order are usually something that you entered when you were setting up the UPS order, and could be anything that helps identify the order, such as a PO number, or a department where the shipment actually goes. Could be an internal code of some kind.
If you did not originally set up the UPS order, then the shipper may have used an internal order sequence number, or some other information that helps identify the order, if it is ever needed.