spoon

Description: spoon port scanner.
It uses a customized SYN-stealth portscanning method, in order to as quickly as possible enumerate large networks.
From what we've observed; it's faster than nmap. However, nmap offers more features.
If you're a .NET developer and/or network engineer, you might be interested to check it out.
Both the source code and an executable can be found within the rar-archive.
Lists of country-netranges can be downloaded from here.
Language: VB.Net
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Released in this post.