Transferring a domain name from one registrar company to another normally entails the use of a special transfer code, which different registrar companies call an EPP authentication code, a domain name password or an AuthInfo code. This code can be used as a safety measure against unapproved transfer attempts with all gTLD and with most ccTLD extensions. It can be obtained only by the owner of the specific domain name and is provided by the present registrar company. It must be given to the new domain name registrar company because the transfer cannot be started without it. The code is case-sensitive and usually includes numbers and special characters, so as to obstruct unauthenticated people from cracking it. Some registrar companies even change the codes of domain names registered through them after a particular interval of time for better safety.