ISBN.ORG - Site Information

U.S ISBN Agency - Welcome to the U.S. ISBN Agency, the official source for ISBNs in the United States. Welcome to the U.S. ISBN Agency, the official source for ISBNs in the United States. No other source can assign legitimate ISBNs to US publishers. Bowker provides technical advice on uses of the ISBN standard to the publishing industry.  Also includes SAN and EAN Bookland Bar Code information. Isbn.org

To improve performance of SITEINFO service and to prevent its excessive high-volume use by a single source, we implemented a randomly generated Access Code that must be entered before running a SITEINFO request.

The Access Code in the box is provided in graphics format. It has letters which are generated randomly and the symbol images are distorted. The distorted symbols cannot be read by computer programs which are used for mass-collect email addresses and any customer information. Only humans can read the distorted symbols and pass the access code. The Access Code improves performance of our services. It prevents excessive high-volume use by a single source.

The services that require Access Codes are: