The syntax is as follows: nmap -iL /tmp/test.txt 4. Create a text file as follows:Īppend names as follows: This is useful to scan a large number of hosts/networks. The -iL option allows you to read the list of target systems using a text file. Read list of hosts/networks from a file (IPv4) You can scan a range of IP address using a wildcard: nmap 192.168.1.*įinally, you scan an entire subnet: nmap 192.168.1.0/24 3. You can scan a range of IP address too: nmap 192.168.1.1-20 Scan a single host or an IP address (IPv4) using nmapįig.01: nmap output 2. OpenBSD: Install nmap Network Security Scannerġ.

CentOS / RHEL: Install nmap Network Security Scanner.Debian / Ubuntu Linux: Install nmap Software For Scanning Network.All three systems are connected via switch.Again, feel free to install few services such as a web-server, file server and so on. This is a fully patched server with firewall. server2 can be powered by Linux / Unix / MS-Windows operating systems.Feel free to install a few services such as a web-server, file server and so on. server1 can be powered by Linux / Unix / MS-Windows operating systems.The nmap command must be installed on this computer. It is used for scanning your local network. wks01 is your computer either running Linux/macOS (OS X) or Unix like operating system.Port scanning may be illegal in some jurisdictions. Nmap Command Examples in Linux and Unix – Sample setup (LAB) for Locate and remove computers which don’t meet the organization’s minimum level of security.Search for unauthorized servers or network service on your network.See if the system is infected with malware or virus.Find out what ports are open on the machine that you just scanned?.Discover the operating system of your target machine.What IP addresses did you find running on the local network?.Find running computers on the local network.It was originally written by Gordon Lyon and it can answer the following questions easily: While Nmap is commonly used for security audits, many systems and network administrators find it useful for routine tasks such as network inventory, managing service upgrade schedules, and monitoring host or service uptime. Nmap uses raw IP packets in novel ways to determine what hosts are available on the network, what services (application name and version) those hosts are offering, what operating systems (and OS versions) they are running, what type of packet filters/firewalls are in use, and dozens of other characteristics. It was designed to rapidly scan large networks, although it works fine against single hosts. Nmap (“Network Mapper”) is an open source tool for network exploration and security auditing.

Zenmap port scanner