Transferring a domain from one company to another usually entails the use of a special transfer authorization code, which different registrar companies call an EPP authentication code, a domain name password or an Auth-Info code. This code can be used as a safety mechanism against unsanctioned 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 company. It must be given to the new domain name registrar company because the transfer procedure cannot be initiated without it. The code is case-sensitive and ordinarily contains numbers and special characters, so as to obstruct unauthenticated persons from guessing it. Certain registrar companies even change the codes of domain names registered through them after a particular period of time for even greater security.