If you want to transfer a domain from one company to another, you will need to go through several safety procedures. One of them is getting a unique EPP authentication code from the present domain name registrar – as long as you are the domain registrant, since the code is emailed to the domain owner’s email and nobody else can get it. You need to give this code to the new registrar company, otherwise they won’t be able to initiate the domain name transfer. The EPP authorization codes are case-sensitive and may comprise of digits or special symbols such as commas or dots, which can be easily miswritten, so make sure you copy & paste the correct code. As an extra safety measure, the transfer authorization code for a domain may be reset regularly. Certain companies refer to this code as an Auth key, a domain secret or a domain password as well.