Aug. 15, 2020

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#NMAP - Basic Usage#

nmap is an free, open-source and powerful tool used to discover hosts and services on a computer network. In our example, we are using nmap to scan this machine to identify all services that are running on a particular port. nmap has many capabilities, below > is a table summarizing some of the functionality it provides. {from TryHackme}

Here are some of the basic switches/flags that your can use when running an nmap scan:

nmap flag Description
-sV Attempts to determine the version of the services running
-p {port} or -p- Port scan for port or scan all ports
-Pn Disable host discovery and just scan for open ports
-A OS and version detection, runs integrated scripts
-sC Scan with the default nmap scripts
-v Verbose mode
-sU UDP port scan
-sS TCP SYN port scan

#How to Scan Nmap Ports#

To scan Nmap ports on a remote system, enter the following in the terminal:

  sudo nmap {target_IP}

Replace the {target_IP} with the IP address of the system you’re scanning. This is the most basic format for Nmap, and it will return information about the ports on that system. While is this a quick scan, it wont scan all ports by default. To specify all ports look at the -p- flag in the previous table.

In addition to scanning by IP address, you can also use the following commands to specify a target:

#To scan a host:
nmap www.hostname.com

#To scan a range of IP addresses (.1 – .10):

#To run Nmap on a subnet:

#To scan targets from a text file:
nmap –iL textlist.txt

Happy hacking.

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