SoftPerfect Network Scanner is a free multi-threaded IP, NetBIOS and SNMP
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 the network
(including system and hidden).
In addition, it allows you to mount shared folders 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.