Subnet Tool
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SubnetTool is a network application for Windows that has some features 
like port scan,subnet design,host lookup,trace route,Query whois,NetBIOS scan.


Port scan
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Port scan can let you browse local or remote host and check which ports open.

Host lookup
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Host lookup can let you transfer domain name to ip address.

Trace route
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Trace route can let you trace the route between any host.

Query whois
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Query whois can let you query for info on sites, ips.

NetBIOS scan
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NetBIOS scan can let you Scan the Internet finding host using NetBIOS and File and Printer Sharing.