ISBN 9643802943 hat failed the check­sum digit test.
The following 12 formally correct ISBNs were determined. Starting from these ISBNs the value 9643802943 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: German language
ISBNas­su­med er­rorCatalogs for checking
3-643-80294-3first digit was chan­ged. amazon.co.uk amazon.com amazon.de
 
ISBN prefix group: India
ISBNas­su­med er­rorCatalogs for checking
93-438-0294-3second digit was chan­ged. amazon.co.uk amazon.com amazon.de
 
ISBN prefix group: Hong Kong, China
ISBNas­su­med er­rorCatalogs for checking
962-380-294-3third digit was chan­ged. amazon.co.uk amazon.com amazon.de
 
ISBN prefix group: Iran
ISBNas­su­med er­rorCatalogs for checking
964-340-298-35th and 9th digits were swap­ped. amazon.co.uk amazon.com amazon.de
964-380-204-3eighth digit was chan­ged. amazon.co.uk amazon.com amazon.de
964-380-249-38th and 9th digits were swap­ped. amazon.co.uk amazon.com amazon.de
964-380-294-9tenth digit was chan­ged. amazon.co.uk amazon.com amazon.de
964-380-297-3ninth digit was chan­ged. amazon.co.uk amazon.com amazon.de
964-380-994-3seven­th digit was chan­ged. amazon.co.uk amazon.com amazon.de
964-390-294-3fifth digit was chan­ged. amazon.co.uk amazon.com amazon.de
964-7802-94-3fourth digit was chan­ged. amazon.co.uk amazon.com amazon.de
 
ISBN prefix group: Bangladesh
ISBNas­su­med er­rorCatalogs for checking
984-36-0294-32nd and 5th digits were swap­ped. amazon.co.uk amazon.com amazon.de

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