The CCDC licence portal allows you to view your current licence information and also obtain a list of all activations that have been carried out, including when the activation occurred and the hostname of the system the licence was activated on.
To access the licence portal, click on the above link. If you are not already you will need to log in to the CCDC website. Then enter the customer id and activation key details for the licence you want to review.
The licence portal will also allow you to carry out an offline activation if you need to - for details see this FAQ.