|  08-05-2021, 04:47 PM | #1 | 
| Library Breeder (She/Her)            Posts: 1,301 Karma: 1937893 Join Date: Apr 2015 Location: Fullerton, California Device: Paperwhite 2015 (2), PW 2024 (12 GEN), PW 2023 (11 GEN), Scribe (1st) | 
				
				What identifier is this?
			 
			
			Amazon lists this as a "Mobi7 ASIN" number, but It is on books that are from Amazon or have been sent to my Kindle.  I am trying to import a list of data on books with these identifiers but there are no titles/authors this is just listed as an ASIN but the format is MOBI7. I've seen them show up sometimes when I import MOBI files, but going through all my libraries trying to match the books by identifier only is difficult. If I knew what causes it maybe I can figure out better which books to look for. Also, I have come across books with this as an ASIN and another similar string as the mobi-asin. So--- any suggestions? Is it possible that these are the books I sideloaded into my Kindles? They are all pretty old (the ones I have) so maybe these ar UUID? asin:5341e3dc-0fdb-413b-b323-3c07f42dfc75 Yeah, its from books that have been transfered from my Kindle to Calibre - they are the books sideloaded onto my Kindle Last edited by Rellwood; 08-05-2021 at 04:55 PM. | 
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|  08-05-2021, 09:43 PM | #2 | 
| creator of calibre            Posts: 45,604 Karma: 28548974 Join Date: Oct 2006 Location: Mumbai, India Device: Various | 
			
			its a random uuid calibre generates these for mobi it creates by conversion.
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|  08-06-2021, 05:25 PM | #3 | 
| Library Breeder (She/Her)            Posts: 1,301 Karma: 1937893 Join Date: Apr 2015 Location: Fullerton, California Device: Paperwhite 2015 (2), PW 2024 (12 GEN), PW 2023 (11 GEN), Scribe (1st) | 
			
			How is it that is will show up on azw3 books?
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|  08-06-2021, 11:15 PM | #4 | 
| creator of calibre            Posts: 45,604 Karma: 28548974 Join Date: Oct 2006 Location: Mumbai, India Device: Various | 
			
			why shouldnt it show up on azw3 books?
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