What is Advanced LAN Scanner?
Advanced LAN Scanner is a small, easy-to-use, highly configurable network scanner for Win32. And it's 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! This super fast scanning ability is only one of the amazing features of Advanced LAN Scanner. It performs very deep scans on any computer you wish, 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 describe your own save formats!
General Information
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"If you're a techie and have more than one PC at work or home on a network sharing a single Internet connection, you'll welcome this freebie, which offers surprisingly powerful scanning capabilities. Use it for everything from troubleshooting Internet connections, to network configuration, to making sure your PCs are as safe as possible when they're on the Internet.
When you first run the program, you may encounter an error message, saying that a default configuration is being used. You can safely ignore that message. Simply click the scan button, and it goes to work. It looks across your network, finds all PCs on it, and then gives you quite a bit of detail about each. Besides the local IP address of each PC, you'll also find which ports on each PC are open. Armed with that information, you can use a firewall to close them down.
In addition to open and closed ports, you'll see lots more information, such as what services are running on each PC, the NetBIOS names (if any) associated with each, and even a list of users and groups on each system. If any machines have shared folders, you'll see those as well. All this data is immensely useful to those who want to keep their PCs secure, or need to troubleshoot networks or Internet.
Making the software all the more remarkable is that it's free."
Refer to: http://www.radmin.com/