How to scan open ports with Nmap | Binhacker

 What is Nmap?

Nmap is the abbreviation for Network Mapper. Nmap is an open source programme released under the General Public License. The tool helps network administrators and security researchers to discover, monitor, and troubleshoot TCP/IP systems. It is a Network Scanning Utility created by Gordon "Fyodor" Lyon 

and is actively managed by a community of volunteers.

Scan open ports with Nmap

Installation 

Installing Nmap is not too dificult. Read the article given below for error free installation of Nmap on your computer.

How to install Nmap in windows

Basic Scanning Techniques

Executing Nmap with no command line options will perform a basic scan on the specified target. A target can either be a IP Address or a Host Name.

nmap 192.168.10.0

Scan Open Ports With Nmap

The resulting scan shows the status of ports detected on the specified target. The table below describes the output fields displayed by the scan

PORT	STATE	SERVICE
Port Number/protocol	Status of the port	Type of service running on the port

Scanning Multiple Targerts 

We can scan bulk targets to save our efforts and time. The easiest way of scanning multiple targets in Nmap is to string together the target IP addresses or Host names on the command line separated with spaces.

nmap 192.168.10.0  192.168.10.1  192.168.10.2

Scanning an IP Range

A range of IP Addresses can also be used for target specification as demonstrated in the example below.

nmap 192.168.10.0-100

Scanning an entire Subnet

Nmap can also be used for scanning an entire Subnet using CIDR (Classless Inter-Domain Routing) notation. 

nmap 192.168.10.0/24

Scanning a List of targets

We can scan a large number of systems to scan, we can enter the IP addresses or host names in a text file and use that files as input for Nmap on the terminal.

 

nmap -iL list.txt