(User manual of nmap network detection and security scanning tool nmap is a network detection and security scanning program. System managers and individuals can use this software to scan large networks and obtain information about which host is running and what services it provides. Nmap supports many scanning technologies, such as UDP, tcpconnect(), tcpsyn (half open scanning), reverse flag, ICMP, fin, ACK scanning, xmastree, syn scanning and null scanning. Details can be obtained from the scan type section. Nmap also provides some advanced features, such as detecting operating system types through tcp/ip protocol stack features, secret scanning, dynamic delay and retransmission computing, parallel scanning, detecting closed hosts through parallel Ping scanning, bait scanning, avoiding port filtering detection, direct RPC scanning (no port mapping), fragment scanning, and flexible target and port setting)
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