Advanced Port Scanner 1.3 (Free) - Small, fast, robust and easy-to-use port scanner for Windows which uses a multithread technique, so you can scan ports very fast!

Advanced Port Scanner 1.3 (Free) - Small, fast, robust and easy-to-use port scanner for Windows which uses a multithread technique, so you can scan ports very fast!: "What is Advanced Port Scanner?
Advanced Port Scanner is a small, fast, robust and easy-to-use port scanner for Win32 platform. It uses a multithread technique, so on fast machines you can scan ports very fast. Also, it contains descriptions for common ports, and can perform scans on predefined port ranges."