Transferring a domain name from one company to another normally entails the use of a special transfer code, which different companies call an EPP authentication code, a domain name password or an AuthInfo code. This code can be used as a safety measure against unsolicited transfer attempts with all gTLD and with most ccTLD extensions. The code can be obtained only by the owner of the particular domain and is provided by the current registrar. It must be given to the new registrar company because the transfer cannot be started without it. The code is case-sensitive and frequently contains numbers and special symbols, so as to stop unauthenticated people from cracking it. Certain domain name registrars even change the codes of domains registered through them after a particular period of time for greater safety.