Transferring a domain from one company to another commonly entails the use of a special transfer code, which different companies refer to as an EPP authentication code, a domain password or an Auth-Info code. This code can be used as a security mechanism against unwanted transfers with all generic and with most country-code extensions. The code can be obtained only by the domain name registrant and is issued by the present registrar company. It must be given to the new domain registrar company because the transfer cannot be started without it. The code is case-sensitive and commonly contains numbers and special characters, so as to hinder unauthenticated persons from hijacking it. Some domain name registrars even reset the codes of domain names registered through them after a given interval of time for even greater safety.