This app was mentioned in 3 comments, with an average of 1.67 upvotes
It seems that the tech can be embedded in other apps, so the code by itself is not sufficient to identify this (especially given that there are so few unique codes, this makes sense). We need a missing clue to find out. Do you have any clues in pages relating to the exact geocache?
I saw a mention of Layar in the context of geocaching, but I'm not even 10% sure that's the right answer. Sorry.