SoftPerfect Network Scanner is a free multi-threaded IP, NetBIOS and SNMP scanner with a modern interface and many advanced features. It is intended for both system administrators and general users interested in computer security. The program pings computers, scans for listening TCP/UDP ports and displays which types of resources are shared on the network (including system and hidden).

Changelog:
Added the /file command line switch to source a set of IP addresses to scan from a file.
Fixed DHCP discovery as it failed to reuse a port if it has already been allocated to another process.
Improved WMI query builder performance when retrieving class example values.

Program Information Category: Internet and communication Type: Free Version: 5.1.3 Size: 723KB Works on: Windows Product page: here