This demonstration of the CNAM-Service allows you to fiddle around with all the available options and shows you the associated request for the service.
Entering your API-Key is required for this demonstration.

You can choose between two search options: phone number and name. A search value has to be entered in at least one of the fields in the grey section. These are the search criteria.
The section below the search criteria can be used to define the result of the request. The number of entries in the result, the format of the output and the fields in the output can be configured.
The request as well as it's result will be displayed when you hit the request button.
More detailed information can be found in the documentation.