SoftPerfect Network Scanner

SoftPerfect Network Scanner is a multi-threaded IP, NetBIOS and SNMP scanner. The program pings computers, scans for listening TCP ports and displays which types of resources are shared on the network.
In addition, it allows you to mount shared folders as network drives, browse them using Windows Explorer, check for a user-defined port and report back if one is open. It can also resolve host names and auto-detect your local and external IP range. It supports remote shutdown and Wake-On-LAN.