Nmap

nmap.org
nmap.org/dist

Introduction

Nmap (Network Mapper) is a security scanner originally written by Gordon Lyon (also known by his pseudonym Fyodor Vaskovich) used to discover hosts and services on a computer network, thus creating a “map” of the network.

Installation

$ sudo apt-get install nmap -y

Usage

$ sudo nmap -Pn -sS -T4 example.com -p-

-Pn : tells nmap not to use ping to determine whether a system is running; instead, it considers all hosts “alive.”
-sS : runs a stealth TCP scan, half open scan. Need sudo access to run
-T4 : prohibits the dynamic scan delay from exceeding 10 ms for TCP ports
example.com : target website name
-p- : scan all available ports

Know more about scanning
nmap.org/book

Misc

NSE(Nmap Scripting Engine)
nmap.org/nsedoc/

# nmap --script http-title -sV -p 80 example.com

Useful Links

sectools.org
insecure.org

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