SoftPerfect Network Scanner

  A free multi-threaded IP,SNMP and NetBIOS scanner with a modern interface and several advanced features. It is intended for both system administrators and users who are interested in computer security. The program pings computers, scans for listening TCP ports and shows what types of resources are shared on a network (including system and hidden). In addition, it allows you to mount shared resources as network drives, browse them using Windows Explorer, filter the results list and more. SoftPerfect Network Scanner can also check for a user-defined port and report if it is found open, resolve host names and auto-detect your local and external IP range.