Individual skill

tools-nmap

Operate nmap and masscan for port/service scanning of in-scope hosts — scan-type selection (SYN/connect/UDP), version and OS detection, NSE vuln scripts, output formats, and the masscan-wide-then-nmap-deep pattern. Load when recon surfaces hosts/IPs and you need open ports, service versions, or OS fingerprints. Signals: nmap, masscan, -sV -sC -O, --script vuln, -p1-65535, --rate, "dnet: Failed to open device", top-ports, -oX.

skills/tools/tools-nmap/SKILL.md

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Last checked: Nov 7, 2026

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Repository stars (not skill ratings): 27
Repository last updated: Oct 14, 2026
License: MIT

Observed agent integration: No specific integration evidence. Standard SKILL.md installation does not imply verified compatibility.

agent-skills Repository topic
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engineering Derived category

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SKILL.mdcore · 5,023 bytes
SKILL.mdcore · 5,023 bytes
SKILL.mdcore · 5,023 bytes
SKILL.mdcore · 5,023 bytes
SKILL.mdcore · 5,023 bytes

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# nmap & masscan port scanning

## When it applies
You have in-scope hosts or IP ranges (confirmed in `scope.txt` — see `tradecraft-scope-roe`) and
need the network attack surface: open ports, service versions, OS guesses. This is the
active-scanning step that follows passive enumeration (`recon-subdomain-enum`, `recon-arsenal`) and
feeds service-specific testing (`network-service-attacks`, `web-arsenal` for anything HTTP).

## Why it works
nmap crafts raw packets to classify ports (open/closed/filtered) and then speaks each discovered
service's protocol just enough to fingerprint its version; its NSE script engine adds per-service
checks on top. masscan trades per-host depth for raw speed (its own TCP stack, millions of pps), so
the efficient pattern is: masscan for breadth across many hosts/ports, nmap for depth on the hits.