How to Use Nmap to Scan a Subnet

Find Devices Connected to Your Network with nmap

1. Step 1: Open the Ubuntu command line. ...
2. Step 2: Install the network scanning tool Nmap. ...
3. Step 3: Get the IP range/subnet mask of your network. ...
4. Step 4: Scan network for connected device(s) with Nmap. ...
5. Step 5: Exit the Terminal.

1. How do I scan a network with nmap?
2. How do I scan a device subnet?
3. How do I scan a range of IP addresses with nmap?
4. Is Nmap scanning illegal?
5. What are Nmap commands?
6. What tool represents a scanning tool?
7. How do I find IP conflict tool?
8. How do I ping a range of IP addresses?
9. How do I scan multiple IP addresses?
10. What is aggressive scan in nmap?
11. Does nmap scan all ports?
12. Why is port scanning dangerous?
13. Is website scanning legal?
14. Is nikto illegal?

How do I scan a network with nmap?

Go to K menu > Auditor > Scanning > Network Scanner > Nmap (Network scanner). A command line window should open. At the top it will list all of the various options for Nmap.

How do I scan a device subnet?

To rapidly scan a network yourself using native operating system (OS) capabilities, follow these steps.

1. Open the command prompt.
2. Enter the command “ipconfig” for Mac or “ifconfig” on Linux. ...
3. Next, input the command “arp -a”. ...
4. Optional: Input the command “ping -t”.

How do I scan a range of IP addresses with nmap?

In this cheat sheet, you will find a series of practical example commands for running Nmap and getting the most of this powerful tool.
...
Nmap Target Selection.

Is Nmap scanning illegal?

Using Nmap is not exactly an illegal act since no federal law in the United States explicitly bans port scanning. Effective use of Nmap can protect your system network from intruders. However, unapproved port scanning for whatever reason can get you jailed, fired, disqualified, or even prohibited by your ISP.

What are Nmap commands?

Nmap Commands

• Ping Scanning. As mentioned above, a ping scan returns information on every active IP on your network. ...
• Port Scanning. There are several ways to execute port scanning using Nmap. ...
• Host Scanning. ...
• OS Scanning. ...
• Scan The Most Popular Ports. ...
• Output to a File. ...
• Disable DNS Name Resolution.

What tool represents a scanning tool?

Nmap as the name suggests maps your network and its ports numerically hence it is also known as Port Scanning Tool. Nmap comes with NSE (Nmap Scripting Engine) scripts to detect network security issues and misconfiguration.

How do I find IP conflict tool?

Here is how you can check it:

1. On an unaffected host on the same network, open up a command prompt. On a Windows machine, type "arp -a [suspected duplicate IP]" and hit enter. ...
2. The output of the response should contain a MAC address. Compare this address to the affected machine.

How do I ping a range of IP addresses?

Windows

1. Press the "Windows" key and type "command." Right-click "Command Prompt" and choose "Run As Administrator..." Confirm the request.
2. Use the DOS "FOR" command to create a loop from one to 254, the range of valid IP addresses on a 192.168.1.0 network.

How do I scan multiple IP addresses?

You would simply type: nmap 192.168. 10.1-100 and it will output any and all networked hardware that is currently on and connected between those IP address ranges. If you want, you can also change this to a different class of subnet, or a range of networks by doing the same thing, but typing 192.168. 1-100.

What is aggressive scan in nmap?

Aggressive Scanning

Nmap has an aggressive mode that enables OS detection, version detection, script scanning, and traceroute. You can use the -A argument to perform an aggressive scan. > nmap -A scanme.nmap.org. Aggressive scans provide far better information than regular scans.

Does nmap scan all ports?

By default, Nmap scans the 1,000 most popular ports of each protocol it is asked to scan. Alternatively, you can specify the -F (fast) option to scan only the 100 most common ports in each protocol or --top-ports to specify an arbitrary number of ports to scan.

Why is port scanning dangerous?

How Dangerous Are Port Scans? A port scan can help an attacker find a weak point to attack and break into a computer system. ... Just because you've found an open port doesn't mean you can attack it. But, once you've found an open port running a listening service, you can scan it for vulnerabilities.

Is website scanning legal?

You should always check the legality of web vulnerability scanning in the applications you are testing, before using a vulnerability scanner. You should also ensure you have a target site owner's permission to carry out vulnerability scanning before commencing any such activity. Doing so without permission is illegal.

Is nikto illegal?

Please not that may be illegal and punishable by law to scan hosts without written permission. Do not use nikto on HackingTutorials.org but use Virtual machines for practice and test purposes. Nikto will now display the Apache, OpenSSL and PHP version of the targeted webserver.