Scan multiple IP address or subnet (IPv4)
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nmap 192.168.1.1 192.168.1.2 192.168.1.3
## works with same subnet i.e. 192.168.1.0/24
nmap 192.168.1.1,2,3
You can scan a range of IP address too:
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nmap 192.168.1.1-20
You can scan a range of IP address using a wildcard:
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nmap 192.168.1.*
Finally, you scan an entire subnet:
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nmap 192.168.1.0/24
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Read list of hosts/networks from a file (IPv4)
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The -iL option allows you to read the list of target systems using a text file. This is useful to scan a large number of hosts/networks. Create a text file as follows:
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cat > /tmp/test.txt
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nmap -iL /tmp/test.txt
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Excluding hosts/networks (IPv4)
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When scanning a large number of hosts/networks you can exclude hosts from a scan:
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nmap 192.168.1.0/24 --exclude 192.168.1.5
nmap 192.168.1.0/24 --exclude 192.168.1.5,192.168.1.254
OR exclude list from a file called /tmp/exclude.txt
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nmap -iL /tmp/scanlist.txt --excludefile /tmp/exclude.txt
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Turn on OS and version detection scanning script (IPv4)
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nmap -A 192.168.1.254
nmap -v -A 192.168.1.1
nmap -A -iL /tmp/scanlist.txt
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Find out if a host/network is protected by a firewall
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nmap -sA 192.168.1.254
nmap -sA
blackhole.n0where.net..
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Scan a host when protected by the firewall
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nmap -PN 192.168.1.1
nmap -PN
blackhole.n0where.net..
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Scan an IPv6 host/address
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The -6 option enable IPv6 scanning. The syntax is:
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nmap -6 IPv6-Address-Here
nmap -6
blackhole.n0where.netnmap -6 2607:f0d0:1002:51::4
nmap -v A -6 2607:f0d0:1002:51::4
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Scan a network and find out which servers and devices are up and running
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This is known as host discovery or ping scan:
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nmap -sP 192.168.1.0/24
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How do I perform a fast scan?
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nmap -F 192.168.1.1
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Display the reason a port is in a particular state
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nmap --reason 192.168.1.1
nmap --reason
blackhole.n0where.net..
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Show host interfaces and routes
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nmap --iflist
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How do I scan specific ports?
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map -p [port] hostName
## Scan port 80
nmap -p 80 192.168.1.1
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## Scan TCP port 80
nmap -p T:80 192.168.1.1
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## Scan UDP port 53
nmap -p U:53 192.168.1.1
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## Scan two ports ##
nmap -p 80,443 192.168.1.1
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## Scan port ranges ##
nmap -p 80-200 192.168.1.1
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## Combine all options ##
nmap -p U:53,111,137,T:21-25,80,139,8080 192.168.1.1
nmap -p U:53,111,137,T:21-25,80,139,8080
blackhole.n0where.netnmap -v -sU -sT -p U:53,111,137,T:21-25,80,139,8080 192.168.1.254
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## Scan all ports with * wildcard ##
nmap -p "*" 192.168.1.1
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## Scan top ports i.e. scan $number most common ports ##
nmap --top-ports 5 192.168.1.1
nmap --top-ports 10 192.168.1.1
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How do I detect remote operating system?
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nmap -O 192.168.1.1
nmap -O --osscan-guess 192.168.1.1
nmap -v -O --osscan-guess 192.168.1.1
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How do I detect remote services (server / daemon) version numbers?
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nmap -sV 192.168.1.1
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The fastest way to scan all your devices/computers for open ports ever
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nmap -T5 192.168.1.0/24
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Only show open (or possibly open) ports
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nmap --open 192.168.1.1
nmap --open
blackhole.n0where.net.
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Show all packets sent and received
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nmap --packet-trace 192.168.1.1
nmap --packet-trace
blackhole.n0where.net.
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Scan a host using TCP ACK (PA) and TCP Syn (PS) ping
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If firewall is blocking standard ICMP pings, try the following host discovery methods:
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nmap -PS 192.168.1.1
nmap -PS 80,21,443 192.168.1.1
nmap -PA 192.168.1.1
nmap -PA 80,21,200-512 192.168.1.1
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Scan a host using IP protocol ping
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nmap -PO 192.168.1.1
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Scan a host using UDP ping
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This scan bypasses firewalls and filters that only screen TCP:
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nmap -PU 192.168.1.1
nmap -PU 2000.2001 192.168.1.1
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Find out the most commonly used TCP ports using TCP SYN Scan
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### Stealthy scan ###
nmap -sS 192.168.1.1
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### Find out the most commonly used TCP ports using TCP connect scan (warning: no stealth scan)
### OS Fingerprinting ###
nmap -sT 192.168.1.1
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### Find out the most commonly used TCP ports using TCP ACK scan
nmap -sA 192.168.1.1
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### Find out the most commonly used TCP ports using TCP Window scan
nmap -sW 192.168.1.1
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### Find out the most commonly used TCP ports using TCP Maimon scan
nmap -sM 192.168.1.1
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Scan a host for UDP services (UDP scan)
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Most popular services on the Internet run over the TCP protocol. DNS, SNMP, and DHCP are three of the most common UDP services. Use the following syntax to find out UDP services:
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nmap -sU nas03
nmap -sU 192.168.1.1
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Scan for IP protocol
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This type of scan allows you to determine which IP protocols (TCP, ICMP, IGMP, etc.) are supported by target machines:
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nmap -sO 192.168.1.1
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Scan a firewall for security weakness
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The following scan types exploit a subtle loophole in the TCP and good for testing security of common attacks:
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## TCP Null Scan to fool a firewall to generate a response ##
## Does not set any bits (TCP flag header is 0) ##
nmap -sN 192.168.1.254
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## TCP Fin scan to check firewall ##
## Sets just the TCP FIN bit ##
nmap -sF 192.168.1.254
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## TCP Xmas scan to check firewall ##
## Sets the FIN, PSH, and URG flags, lighting the packet up like a Christmas tree ##
nmap -sX 192.168.1.254
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Scan a firewall for packets fragments
The -f option causes the requested scan (including ping scans) to use tiny fragmented IP packets. The idea is to split up the TCP header over several packets to make it harder for packet filters, intrusion detection systems, and other annoyances to detect what you are doing.
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nmap -f 192.168.1.1
nmap -f fw2.nixcraft.net.in
nmap -f 15 fw2.nixcraft.net.in
## Set your own offset size with the --mtu option ##
nmap --mtu 32 192.168.1.1
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Cloak a scan with decoys
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The -D option it appear to the remote host that the host(s) you specify as decoys are scanning the target network too. Thus their IDS might report 5-10 port scans from unique IP addresses, but they won’t know which IP was scanning them and which were innocent decoys:
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nmap -n -Ddecoy-ip1,decoy-ip2,your-own-ip,decoy-ip3,decoy-ip4 remote-host-ip
nmap -n -D192.168.1.5,10.5.1.2,172.1.2.4,3.4.2.1 192.168.1.5
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Scan a firewall for MAC address spoofing
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### Spoof your MAC address ##
nmap --spoof-mac MAC-ADDRESS-HERE 192.168.1.1
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### Add other options ###
nmap -v -sT -PN --spoof-mac MAC-ADDRESS-HERE 192.168.1.1
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### Use a random MAC address ###
### The number 0, means nmap chooses a completely random MAC address ###
nmap -v -sT -PN --spoof-mac 0 192.168.1.1
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How do I save output to a text file?
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nmap 192.168.1.1 > output.txt
nmap -oN /path/to/filename 192.168.1.1
nmap -oN output.txt 192.168.1.1
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