Can't find what you're looking for? Contact Us

FAQ for existing publishers

This applies only to publishers who have bought an allocation of at least ten ISBNs. If you have a single ISBN, you can either apply for another single, or for a larger allocation. Each ISBN publisher prefix allows for a fixed number of ISBNs. When these are exhausted publishers must apply for a new ISBN prefix. It is quite common for a publisher to be identified by more than one ISBN prefix.