Here you can calculate modulus 11 checkdigit for ISBN barcode.
For multiple inquiry with the same maker code, choose
<Inquiry with specified Publisher Code>,
and specify the publisher code (2 to 6 digits),
then specify the quantity of items to calculate.
If you want to inquire by series of book codes,
choose Serial and specify the book code to begin at.
If the book code is separated, choose One-by-one.
For one-by-one inquiry of different publisher codes, choose
<Inquiry one by one>,
then specify the quantity of items to calculate.
When you finished to input all values above, click
<Go to Input Form> button.
If you want to re-configure values from the beginning, click
<Reset> button.