# Masscan

> masscan

- Skill: `sameh1200/masscan-2` (Agent Skill, multi-file: 2 files)
- Install (CLI): `npx skillmds@latest add sameh1200/masscan-2`
- Raw SKILL.md: https://api.skillmd.com/api/skills/sameh1200/masscan-2/raw
- Safety review: pending (external: skill-scanner PASS, skillspector PASS)
- Works with: Claude Code, Claude.ai, OpenAI Codex
- Category: Coding & Dev Tools
- Author: Sameh1200 (https://skillmd.com/u/sameh1200)
- Updated: 2026-09-22
- Page: https://skillmd.com/skills/sameh1200/masscan-2

---

# masscan

## Repo
https://github.com/robertdavidgraham/masscan

## Installation
```bash
sudo apt install masscan

# From source
git clone https://github.com/robertdavidgraham/masscan
cd masscan
make
sudo make install
```

## Using
```bash
# Fast top ports
sudo masscan -p1-1000 192.168.1.0/24 --rate 10000 -oL open.txt

# Specific ports
sudo masscan -p80,443,8080,8443 target.com --rate 5000

# With banners
sudo masscan -p80,443 target.com --banners --rate 1000
```

## Real-time usage (typical)
| Scope | Duration | Notes |
|-------|----------|-------|
| Single IP top 1000 | < 5 s | high rate |
| /24 top ports | 10 – 60 s | --rate 10000 |
| Internet-scale | minutes | only authorized |
| Banner grab | slower | --banners |

Extremely fast. Always stay within authorized scope and local legal limits. High rates can trigger upstream filters.

## Current Step
Ultra-fast large-scale port discovery.

## Next Step
Take open ports into nmap for version detection or naabu for refinement.

## Errors Fixes
- Requires root → always use sudo
- Interface selection → --interface eth0 or -e
- Too aggressive → lower --rate
- Scope → only scan authorized ranges