The ISBN (International Standard Book Number) code was increased to how many digits from 1 January 2007?
International Standard Book Number International Standard Book Number The International Standard Book Number (ISBN) is a unique numeric commercial book identifier. Publishers purchase ISBNs from an affiliate of the International ISBN Agency. An ISBN is assigned to each edition and variation (except reprintings) of a book. For example, an e-book, a paperback and a hardcover edition of the same book would each have a different ISBN. The ISBN is 13 digits long if assigned on or after 1 January 2007, and 10 digits long if assigned before 2007. The method of assigning an ISBN is nation-based and varies from country to country, often depending
International Standard Book Number 2007, and 10 digits long if assigned before 2007. An International Standard Book Number consists of 4 parts (if it is a 10-digit ISBN) or 5 parts (for a 13-digit ISBN): A 13-digit ISBN can be separated into its parts ("prefix element", "registration group", "registrant", "publication" and "check digit"), and when this is done it is customary to separate the parts with hyphens or spaces. Separating the parts ("registration group", "registrant", "publication" and "check digit") of a 10-digit ISBN is also done with either hyphens or spaces. Figuring out how to correctly separate a given ISBN is complicated, because most