On January 1, 2007, a new standard for ISBNs came into effect, adding a fifth digit, making it 13 digits again. This change was necessary to allow ISBNs to be used directly as barcodes on standard products. Therefore, the number 978 or 979 was added to the beginning of the ISBN, and the checksum calculation algorithm was also changed. All previously assigned ISBNs are uniquely converted to new ones (978 + first 9 digits of old ISBN + check digit calculated based on EAN-13).
| Valid symbols: | 0123456789 |
| length: | Fixed, 13 symbols |
| Check digit: | 1, modulo 10 algorithm |
ISBNs assigned to books since 2006 are 13 digits long and consist of 4 fields of variable length..
Prefix: 978 or 979.
Group identifier (language sharing country group).
Publisher code.
Item Number.
Checksum character or check digit.
"ISBN-13" barcode.
| information |
| A number that the operator can use if the label is damaged or cannot be scanned for some reason. "978-0-306-40615-7" is the number encoded in the barcode. |
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