Angry IP scanner is a very fast IP address and port scanner.
It can scan IP addresses in any range as well as their ports. It is cross-platform and lightweight. Not requiring any installations, it can be used anywhere.
Angry IP scanner simply pings each IP address to check if it's alive, then optionally it resolves its hostname, determines the MAC address, scans ports, etc. The amount of gathered data about each host can be extended with plugins.
With help of plugins, Angry IP Scanner can gather any information about scanned IPs. Anybody who can write Java code is able to write plugins and extend functionality of Angry IP Scanner.
In order to increase scanning speed, it uses multithreaded approach: a separate scanning thread is created for each scanned IP address.