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Scan for TCP, TCP SYN and UDP open ports, ping addresses, and ports, perform whois queries or use traceroute commands all from a customizable graphical interface. The tool works with both wireless area networks (WAN) as well as with local area networks (LAN).
Nmap ("Network Mapper") is a free and open source (license) utility for network discovery and security auditing. Many system and network administrators also find it useful for tasks such as network inventory, managing service upgrade schedules, and monitoring host or service...
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