The ADP registration code is a number assigned to a company that uses the services of ADP. Each company has its own registration code to distinguish its employees for the online services. The code is alpha-numeric and often starts with part or all of the company's name.
An employee of a company that uses ADP has the option of registering online. This gives the employee the ability to access the online time card and other online services. The employee needs the company's ADP registration code to complete the online registration process. After choosing the first time user registration link, the ADP website asks for the code.