Nmap

This article is written from 14+ years of offensive security practice. Some links are affiliate links that help keep this site running — I only recommend tools and services I’d use myself. Kali Linux comes loaded with over 600 security tools. If you’re new to penetration testing, that’s not empowering — that’s paralyzing. Here’s the honest truth: working pentesters don’t use most of what’s installed. They use a tight core of tools extremely well, and add specialized ones when a specific engagement calls for it. The practitioners who get hired aren’t the ones who can name every tool — they’re the ones who can actually use ten of them. ...

You don’t memorize Nmap. Nobody does. You keep a cheat sheet, you use it constantly, and eventually the important stuff sticks. This is that cheat sheet — updated for 2026, organized by what you actually do on engagements, not alphabetically by flag name. Covers everything from basic discovery to NSE scripting to firewall evasion. If it’s not here, you probably don’t need it in the field. Target Specification These go at the end of any Nmap command. Mix and match as needed. ...