Nmap (Network Mapper) is a security scanner originally written by Gordon Lyon to discover hosts and services on a computer network to create a "map" of the network. To achieve its goals, Nmap sends specific packets to the target host and then analyzes the response. NMAP is a powerful network tool used to enumerate and test networks.
Usage:
Pure scanning of Nmap (Recommended learning: PHP video tutorial )
By default, nmap will issue an arp ping scan (-sP if the switch is committed), and it will also scan open ports for specific targets in the range 1-10000
The syntax of the following command is as follows:
nmap <目标IP地址>
Where: target IP address = the specified IP of your target machine
（nmap 10.1.1.254）
NMAP normal scan increases the output verbosity (very detailed )
The following command has the following syntax:
nmap -vv 10.1.1.254
where: -vv = switch to activate very detailed settings required for logging
your scan entries
（nmap -vv10.1.1.254）
Nmap’s Custom Port Scan
Nmap’s scan ranges from 1-10000 ports by default. To be more specific about which ports to scan, we will Use the -p switch to specify our port scan range, the advantage is that it will scan a smaller number of ports faster than the predefined default
Syntax:
nmap -p（范围）<目标IP>
Where: -P is the port switch (range) is the port number from 1-65535
(Scan from port range 1-50)
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