From a very clear interface that only shows information, Active Ports provides the user with all the data about each of the ports that are being used and what programs are using them. What's more, Active Ports shows the path of each of the files that have ports open, something that can come in very handy to be able to locate suspicious behaviors.
The other data provided by Active Ports is the remote IP, the status of each of the connections and the kind of protocol that is being used (TCP/IP or UDP). And to make the application even better, it offers us the possibility to kill any process that is currently open.
Therefore, if you want to know what ports are being used and the programs that are using them, download and install Active Ports, it's free.