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Nmap
Nmap "Network Mapper"
Nmap is an open source utility for network exploration or security auditing. It is currently the most popular tool for port scanning, as it has many different and stealthy ways of scanning ports.

Nmap can find open ports and identify Services, Operating system and Firewalls

Nmap works on most platforms and has a wide supporting community.

Nmap is published through insecure.org

Click here to go directly to the Nmap download page
 
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