The “Auth_info” is a password associated with your domain name. This code is created when the domain name is registered by the Registrar, who must give it to you free of charge or give you a way to obtain it. The “Auth_info” replaced the former “holder’s password” procedure on 30 March 2009. It is used to secure operations and to confirm a change of Registrar or a change of holder (‘update domain’ operation).