ISBN 8012312345 hat failed the check­sum digit test.
The following 12 formally correct ISBNs were determined. Starting from these ISBNs the value 8012312345 that you input could have resulted frome one error (error in one digit or transposition of two digits.) You can now check using the links given for the catalogs of amazon.co.uk, amazon.com and amazon.de whether any book is listed for the respective URL. To the home page
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ISBN prefix group: former Czechoslovakia
ISBNas­su­med er­rorCatalogs for checking
80-12-11234-5fifth digit was chan­ged. amazon.co.uk amazon.com amazon.de
80-12-31234-4tenth digit was chan­ged. amazon.co.uk amazon.com amazon.de
80-12-31239-5ninth digit was chan­ged. amazon.co.uk amazon.com amazon.de
80-12-33234-5sixth digit was chan­ged. amazon.co.uk amazon.com amazon.de
80-12-51234-35th and 10th digits were swap­ped. amazon.co.uk amazon.com amazon.de
80-14-31232-54th and 9th digits were swap­ped. amazon.co.uk amazon.com amazon.de
80-15-31234-5fourth digit was chan­ged. amazon.co.uk amazon.com amazon.de
80-323-1214-53rd and 8th digits were swap­ped. amazon.co.uk amazon.com amazon.de
80-523-1234-5third digit was chan­ged. amazon.co.uk amazon.com amazon.de
 
ISBN prefix group: Norway
ISBNas­su­med er­rorCatalogs for checking
82-12-31034-52nd and 7th digits were swap­ped. amazon.co.uk amazon.com amazon.de
 
ISBN prefix group: former Yugoslavia
ISBNas­su­med er­rorCatalogs for checking
86-12-31234-5second digit was chan­ged. amazon.co.uk amazon.com amazon.de
 
ISBN prefix group: Netherlands
ISBNas­su­med er­rorCatalogs for checking
90-12-31234-5first digit was chan­ged. amazon.co.uk amazon.com amazon.de

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