The five parts of an ISBN are as follows:

1. The current ISBN-13 is prefixed by "978"; 
   
2. Group or country identifier which identifies a national or geographic grouping of publishers; 
   
3. Publisher identifier which identifies a particular publisher within a group; 
   
4. Title identifier which identifies a particular title or edition of a title; 
   
5. Check digit is the single digit at the end of the ISBN which validates the ISBN.