Advanced LAN Scanner is a small, easy-to-use, highly configurable network scanner for Win32, plus it is very fast.
Advanced LAN Scanner uses multithreading so you can scan more than 1000 elements per second. If used to scan ports, Advanced LAN Scanner can scan all 65536 ports in less than a minute.
It cab perform deep scans on any computer extracting its users, services, shares and many other useful data. It can connect to a target machine using the default user rights, or you can specify a login and password to use. It includes powerful export options using a script language to customise output.
Free for Windows 95/98/ME/NT4.0/2000/XP/2003.