Cheatsheet - Nmap Network Scanner

2022-11-29 1 min read nmap Erwin Bierens

Nmap is the world’s leading port security network scanner. The Nmap hosted security tool can help you determine how well your firewall and security configuration is working.

This guide will show you how to use Nmap to scan all open ports. This cheatsheet applies to Windows, MacOS and Linux

Click here to download the latest version of Nmap.

Single Port

Scan port 443 on the target system by DNS name:

nmap -p 443 google.com

or based on IP:

nmap -p 443 8.8.8.8

Multiple Ports

Scan ports 1 through 2048 on the target system:

nmap -p 1-2048 google.com

Scan (Fast) the most common ports:

nmap -F google.com

Scan all Ports

To scan all ports (1 - 65535):

nmap -p- google.com

Advanced Port Scans

To scan using TCP connect (it takes longer, but is more likely to connect):

nmap -sT google.com

To perform the SYN scan (testing only half of the TCP handshake):

nmap -sS google.com

Instruct Nmap to scan UDP ports instead of TCP ports, -p specifies the port:

nmap -sU -p 5060 google.com