![]() ifconfig command output on Mac Initiating a scan Your router most likely provides the same size subnet, but if you get a different netmask value, you can use a calculator such as this subnet calculator. 0xffffff00 corresponds to a /24 bit mask. In the screenshot below you can see that my computer has a local IP of 192.168.1.158, and a netmask of 0xffffff00. This will give you details about your network adapter, including the subnet. You can check what network your computer is using with the ifconfig command on Mac and Unix systems and with the ipconfig command on Windows. Luckily it is quite easy to determine your local network range. Most likely your home router provides a .xx type address, though various models may offer a different range such as 10.x.x.x. Get your local network rangeīefore we can scan our local network, we need to determine the correct IP range to scan. Lets see if we can detect any with our scan. If your household is anything like mine, chances are you have a couple of smart phones, smart TVs, lights, you name it, all connected to your Wifi. Nmap done: 1 IP address (1 host up) scanned in 0.27 seconds Scanning your local networkīefore we explore nmap’s extensive command line options, let us scan our local network with a quick default scan. To kick off a simple scan with the defaults just run: nmap -sV 192.168.1.220Īssuming the target system doesn’t block the scan you should see some scan results shortly. This is a vulnerable VM designed for experimenting with penetration testing techniques. If you don’t have any interesting devices on your network you can also install Metasploitable in VirtualBox. We will discover more IPs to scan in a moment. If you don’t know the IP of any devices on your network you can scan 127.0.0.1, the localhost address for now. Instead we will highlight the more common features and options of this tool so that you can begin experimenting on your own.īring up your command line and pick a host on your network. It is a very powerful tool with numerous options. This article is not meant to be a comprehensive overview of all features in nmap. Once you have nmap downloaded and installed we can start exploring a few of the many features available. The download is available on the download page here: Download nmap. Now that we have that covered, let’s get right to it! How to Use nmapįirst go ahead and download nmap for your specific operating system. You will be blocked if you start scanning large swathes of the Internet. However some networks do not tolerate scanning activity very well so a simple scan might turn into a DDoS attack. Nmap is not an exploit tool but a scanning tool so the damage is not as extreme. There is nothing to protect you from amateur mistakes. This poses its own risks and you should be comfortable running commands as root. You must run the tool as root to use the advanced scanning features. The software itself is safe, as in not malicious, if downloaded from the official site linked below. Is nmap safe?īecause nmap is such a powerful tool there are a few things you should know before you install it. Scanning tools such as nmap are used to detect hosts and services on a network. Nmap can also be used to identify service versions, operating systems and much more. Network Mapper (nmap) is a network scanning tool that is used to detect hosts and services on a network. We will be using the highly popular Network Mapper, or nmap. Now that we know why we might want to locate hosts and services available on a network, how do we actually go about doing this? A network scan uses a variety of techniques to detect and fingerprint hosts on a network. If you are curious, you can learn more about the steps involved in a cyber attack. Identifying which hosts are available on a network is part of the reconnaissance phase of a cyber attack. Knowing which devices are running which services is invaluable to a penetration tester as well. It is important to identify unauthorized, or ‘rogue’, devices in order to maintain a high level of network security. Knowing which devices are available on a network is the first step to both attacking and defending your systems. Today I will show you how to use nmap to find devices on your network.
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