Angry IP Scanner is a FREE portable IP address and port scanner that was designed to be fast and very simple to use. Commonly used by network administrators around the world to quickly scan an IP address for host names and open ports. It works by pinging an IP addresses to see if it is alive, then resolves the host-name, determines the MAC address and scans the address for open ports. Additional plugins are available to help gather more data about each host. It requires roughly 888KB for complete stand alone installation.