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It is a free multi-threaded ICMP, Port, IP, NetBIOS, ActiveDirectory and SNMP scanner with many advanced features. It is intended for both system administrators and general users who are interested in computer security. The program performs ping sweep, scans for opened TCP and UDP ports, resource shares and services.
For devices with SNMP capability available interfaces are detected and basic properties displayed.
In addition you have to edit results, save/load results to/from CSV and print network device list and any data in any section can be exported to CSV.
It can also resolve host names and auto-detect your local IP range.

Scan features:

ActiveDirectory
Network neighbourhood
Ping (ICMP)
IP Address
MAC Address (even across routers)
MAC Vendor
Device name
Device domain/workgroup
Logged user
Operating system
BIOS, Model and CPU
System time and Up time
Device description
Type flags (SQL server, Domain controller etc.)
Remote device date and time
TCP and UDP port scanning
SNMP services.
Installed services on device
Shared resources
Sessions
Open Files
Running processes
Terminal sessions
Event Log
Installed software
SAM accounts
WMI Queries
Powerful WhoIs client