A method and system for addressing a unique device from an address book, the method having the steps of: receiving a message having a root token and a secondary token; checking whether the root token exists within the address book, if no, creating a record in the address book with the root and secondary token; and if yes, checking whether the secondary token exists within the address book, if yes, providing a representation of the unique device; and if no, storing the secondary token against the root token in the address book.