SeePurity

Cancerbero is a port scan engine based on nmap. It scans the hosts of a defined network once every configured time interval and stores the results in a MySQL database. It detects changes from last scan, generates alerts with differences, and optionally sends the alert by mail to the owner of the host. It provides a snapshot of the ports which a host has open over time. A Web interface is provided for configuring the system and data mining.

It's a good tool for network administrators with a high number of host to take care.