If you decide to transfer a domain from one company to another, you will need to go through several security steps. One of them is obtaining a unique EPP code from the current domain registrar – on the condition that you are the registrant, since the code is sent to the domain owner’s mailbox and no one else can see it. You’ll have to give this code to the new registrar, otherwise they will not be able to initiate the domain transfer. The EPP authentication codes are case-sensitive and may contain digits or special symbols such as dots or commas, which can be easily mistyped, so make sure you copy & paste the correct code. As an extra safety measure, the transfer code for a domain may be altered regularly. Some companies call this code an Auth key, a domain secret or a domain password as well.