RzKFlow is an easy to use software to collect and present NetFlow records sent from switches or routers. It aggregates the received records for a given interval of time and until midnight. The resulting communication matrices can be stored in well linked web pages and/or CSV files. You can see how many frames and how many bytes are exchanged between the stations (IP addresses), the IP networks, the ports on the network and the autonomous systems ( only available if the router uses BGP). You can use RzKFlow as a standalone program and process the daily saved CSV or html files directly. But RzKFlow was also designed to work as a probe for the accounting and network monitoring software RzK NetControl.