10 Common scan commands for Nmap

NMap, also known as Network Mapper, is a web scan and sniffer toolkit under Linux.
　　
Nmap is a powerful scanner that is often used in network safety penetration testing. The power of function is self-evident. Here are some of its scanning commands. Specifically, we have to rely on everyone to learn, because it is too strong.
　　
1) Get the system type and open port of the remote host
　　
Nmap-ss-p0-sv-o <target>
　　
Here the < target > can be a single IP, or hostname, or domain name, or subnet
　　
-ss TCP SYN Scan (also known as semi-open, or stealth scan)
　　
-P0 allows you to turn off ICMP pings.
　　
-SV Open System version detection
　　
-O attempt to identify the remote operating system
　　
Other options:
　　
-a simultaneously turns on operating system fingerprint and version detection
　　
-v Verbose output scan condition.
　　
Nmap-ss-p0-a-V < target >
　　
2) List of hosts that have opened the specified port
　　
Nmap-st-p 80-og–192.168.1.* | grep Open
　　
3) Find all online hosts on the web
　　
NMAP-SP 192.168.0.*
　　
Or you can also use the following command:
　　
NMAP-SP 192.168.0.0/24
　　
Specify subnet
　　
4) Ping The IP address within the specified range
　　
NMAP-SP 192.168.1.100-254
　　
5) Find an unoccupied IP on a satin web
　　
NMAP-T4-SP 192.168.2.0/24 && egrep "00:00:00:00:00:00″/proc/net/arp
　　
6) Scan for Conficker worm on LAN
　　
Nmap-pn-t4-p139,445-n-v–script=smb-check-vulns–script-args safe=1 192.168.0.1-254
　　
7) Scan the rogue access point (Rogue APs) on the network.
　　
Nmap-a-p1-85,113,443,8080-8100-t4–min-hostgroup 50–max-rtt-timeout
　　
2000–initial-rtt-timeout 300–max-retries 3–host-timeout 20m
　　
–max-scan-delay 1000-oa Wapscan 10.0.0.0/8
　　
8) Use the Decoy scan method to scan the host port
　　
sudo nmap-ss 192.168.0.10-d 192.168.0.2
　　
9) List the reverse DNS records for a single subnet
　　
Nmap-r-SL 209.85.229.99/27 | awk ' {if ($3== "not") print "(" $2″) no PTR "; Else Print$3″is" | grep ' ('
　　
10) How many Linux and Win devices are there on the network?
　　
sudo nmap-f-o 192.168.0.1-255 | grep "Running:" >/tmp/os; echo "$ (Cat/tmp/os | grep Linux | WC-L) Linux device (s) "; echo "$ (Cat/tmp/os | grep Windows | wc-l) window (s) device "

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10 Common scan commands for Nmap